Quartzite is which type of rock - There is no such thing as soft quartzite though. There is only one kind of quartzite and it's hard. A rock labelled as soft quartzite is most likely marble.

 
Physical Properties Quartzite Formation Where is Quartzite Found? Quartzite Uses Rock Composition Quartzite rock is named quartzite because of its quartz content in it. Most specimens contain up to 90% percent quartz. Some specimens may also contain up to 99% quartz.. Don goff

This protolith is a type of sedimentary rock made from the cementation of small grains of sand. What is the parent rock of quartzite? The parent rock to quartzite is sandstone. Quartzite forms from the recrystallization of quartz grains in the sandstone and often the resulting metamorphic rock will preserve vestiges of the original bedding ...30 seconds. 1 pt. The photograph below shows actual crystal sizes in a light-colored igneous rock that contains several minerals, including potassium feldspar, quartz, and biotite mica. granite. gabbro. basalt. rhyolite.The solid bedrock of the Pipestone National Monument is the Sioux Quartzite, a thick stack of ancient layered rocks exposed today in parts of Southwest Minnesota, southeastern South Dakota, and northwest Iowa. The Monument's geologic formations consist of three rock types: pipestone (clay), quartzite (sand), and conglomerate (gravel). An ...The Quarzite is a metamorphic rock formed from pure quartz sandstone. It is white to grey in colour. Orthoquartzite is a very pure quartz sandstone composed of usually well-rounded quartz grains cemented by Silica. Orthoquartzite is often 99% SiO2 with only very minor amounts of iron oxide and trace resistant minerals such as zircon, rutile and ...Below are a few examples of the most popular types of metamorphic rocks. Quartzite. With its glassy gleam and granular texture, quartzite exemplifies metamorphic splendor. This decorative rock originates as pure quartz sandstone before heat and pressure transform it over millions of years. As temperatures rise, the quartz grains …Aug 27, 2023 · Parent Rock Relationships: Schist forms from the metamorphism of pre-existing rocks, which can include various types of sedimentary, igneous, or even other metamorphic rocks. The parent rock, or protolith, provides the initial mineral composition and texture that undergoes changes during metamorphism. Quartzite is a nonfoliated metamorphic rock composed almost entirely of quartz. It forms when a quartz-rich sandstone is altered by the heat, pressure, and chemical activity of metamorphism. Metamorphism recrystallizes the sand grains and the silica cement that binds them together. What Are The 3 Types Of Rocks? In short, there are three different types of rocks that every rock you meet can be classified as. The three types of rocks are: Igneous Rocks; Metamorphic Rocks; Sedimentary Rocks; Igneous Rocks. The first type of rock on this list are the igneous type of rocks. Igneous rocks are more than just a cool name.Dolomite, also known as " dolostone " and " dolomite rock ," is a sedimentary rock composed primarily of the mineral dolomite, CaMg (CO 3) 2. Dolomite is found in sedimentary basins worldwide. It is thought to form by the postdepositional alteration of lime mud and limestone by magnesium-rich groundwater. Dolomite and limestone are very …Jan 24, 2017 · Not only does this make for a tough stone, but it also makes it easy to tell quartzite from the imposters. Quartz is 7 on Mohs hardness scale. That means it’s harder than glass and harder than a knife blade. These things are easy to test with a sample of stone. If a rock that is labeled as quartzite is soft, then it was mislabeled. Conglomerate Composition. Conglomerate is a type of sedimentary rock that is composed primarily of rounded or water-worn pebbles, cobbles, and boulders, which are known as clasts. These clasts are typically cemented together by a matrix of finer-grained sedimentary material, such as sand, silt, or clay.Quartzite is a metamorphic rock derived from sandstone that is distinguished from sandstone by its fracture. Sandstone breaks along grain boundaries, whereas quartzite is so well indurated (hardened) that it breaks across constituent grains. The intense heat and pressure of metamorphism causes the quartz grains to compact and become tightly ...Quartz is the most common mineral on the face of the Earth. It is found in nearly every geological environment and is at least a component of almost every rock type. It frequently is the primary mineral, >98%. It is also the most varied in terms of varieties, colors and forms.Propylitic alteration is a type of hydrothermal alteration that occurs in volcanic and plutonic rocks. It is characterized by the alteration of primary minerals, such as feldspar and quartz, to secondary minerals, such as chlorite, epidote, and sericite. Propylitic alteration typically occurs at lower temperatures (less than 200°C) and involves the …Following are the two types of igneous rock: Intrusive igneous rock: These rocks crystallise below the earth’s surface resulting in large crystals as the cooling takes place slowly. Diorite, granite, and pegmatite are examples of intrusive igneous rocks. Extrusive igneous rock: These rocks erupt onto the surface resulting in small crystals as ... Study with Quizlet and memorize flashcards containing terms like Preexisting rock that is subsequently altered to form a metamorphic rock is termed a _____., _____ commonly serves as a protolith in the formation of quartzite., Broadly, metamorphism involves _____. and more.Definition of quartzite. Let’s now see what type of rock is quartzite by answering the first question: is quartzite foliated or nonfoliated? Quartzite mineral is a non-foliate metamorphic rock, derived primarily from quartz sandstone through a process of heating and pressure. Feb 24, 2020 · Rock Identification Tips. First, decide whether your rock is igneous, sedimentary or metamorphic. Igneous rocks such as granite or lava are tough, frozen melts with little texture or layering. Rocks like these contain mostly black, white and/or gray minerals. Sedimentary rocks such as limestone or shale are hardened sediment with sandy or clay ... Quartzite a nonfoliated metamorphic rock composed almost entirely of quartz. The Brewery Rock ? The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.Table 6.1 A rough guide to the types of metamorphic rocks that form from different parent rocks at different grades of regional metamorphism. You are expected to know the rock names indicated in bold font. Protolith. Very …Oct 16, 2023 · Feldspathic Arenites. These arenites are those sandstones that contain less than 90% of quartz but more of feldspar. Here, feldspar is the main component & contains other unstable components as well such as lithic fragments & other minerals such as mica and heavy minerals, etc. These types of sandstones are having a pink/red colour basically ... Here are the top eight kitchen countertop materials: 1. Quartz. "Quartz is a manmade stone that is composed of roughly 80% to 93% natural material mixed with pigments and resins, making it a very durable and low-maintenance option," Kaercher says. "With quartz, the artificial pigments that are added allow homeowners a wide variety of ...These stones contain some quartzite, along with other minerals and rock types. In general mixed stone quartzites are darker in color than regular quartzites, and they have swirls and blobs of different rock types blended together. The table below outlines the 5 types of sandstone and quartzite. Ways to distinguish sandstone and quartziteQuartz has attracted attention from the earliest times; water-clear crystals were known to the ancient Greeks as krystallos—hence the name crystal, or more commonly rock crystal, applied to this variety. The name quartz is an old German word of uncertain origin first used by Georgius Agricola in 1530. A brief treatment of quartz follows.Earth Science Records: Highest mountain, deepest lake, biggest tsunami and more. Diamonds: Learn about the properties of diamond, its many uses, and diamond discoveries. Aventurine is a translucent quartz or quartzite with sparkling reflections and often an beautiful color. It occurs in green, blue, red, pink, purple, orange, and yellow colors.Lower Stones. stones range in size, from very small (150 millimetres across) to very large (700 millimetres across) can weigh several kilograms. can be any shape: oval, round, rectangular or irregular. grinding stones made from sandstone or quartzite are usually flat. Basalt stones can be more rounded. grinding stones have a worn depression ...The non-foliated appearance of rocks like marble and quartzite are often described as granular or sugary. Protolith rocks composed of just one mineral, for example pure limestone made of nothing but calcite, simply recystallise. In the process of doing so the calcite forms a denser rock consisting of roughly equigranular calcite crystals.Quartz was the mineral upon which the Stone Ages were based. With few exceptions, most early stone tools were fashioned of quartz. Outcrops of quartz that were suitable for tool manufacturing were targeted by some of the earliest known mining activities and the mined quartz was traded across vast distances, even before humans began to establish agricultural societies.Granite is the most common intrusive igneous rock (see figure 2 for an example). Figure 2. Granite is made of four minerals, all visible to the naked eye: feldspar (white), quartz (translucent), hornblende (black), and biotite (black, platy). Igneous rocks make up most of the rocks on Earth.28 Mar 2023 ... It is a metamorphic type of rock containing more than 70% sand & 90% silica in the equigranular type of formation. Quartzite is harder than a ...Table 6.1 A rough guide to the types of metamorphic rocks that form from different parent rocks at different grades of regional metamorphism. You are expected to know the rock names indicated in bold font. Protolith. Very Low Grade (150-300°C) Low Grade (300-450°C) Medium Grade (450-550°C) High Grade (Above 550°C)Quartzite rocks are found all over the world. Learn about the different types and properties of these rocks. Explore how quartzite is formed, where it is found, and the minerals in quartzite.Rock Type: sedimentary Composition: grains of sand that can be feldspar or quartz - the amount of other minerals, such as mica, depend on how much weathering has occurred. Environment: Already existing rocks are eroded and the grains are transported and sorted by rivers. The resulting sand is deposited on beaches, along floodplains or in deltas ... Stress indicates a type of force acting on rock. Strain describes the resultant processes caused by stress and includes metamorphic changes in the minerals. ... The two most common examples of non-foliated rocks are quartzite and marble. Quartzite is a metamorphic rock from the protolith sandstone.Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is an amorphous material known as a " mineraloid ." The result is a volcanic glass with a smooth uniform texture that breaks with a conchoidal fracture (see photo).Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming —that are part of the rock cycle. Sedimentary Rocks Sedimentary rocks are formed from pieces of other existing rock or organic material. There are three different types of sedimentary rocks: clastic, organic (biological), and chemical.However, it is also found in other pale colors. The surface of a Quartzite is grainy and rough. The main component of quartzite is silicon dioxide, SiO2. The rock is called …Parent Rock Relationships: Schist forms from the metamorphism of pre-existing rocks, which can include various types of sedimentary, igneous, or even other metamorphic rocks. The parent rock, or protolith, provides the initial mineral composition and texture that undergoes changes during metamorphism.The reason pure arenite becomes quartzite is that the mineral quartz is stable over a wide range of pressures and temperatures. Under most metamorphic conditions quartz will simply recrystallize, overgrow the existing quartz grains with more quartz, and reorient its quartz crystals to become a new rock type made of quartz. Quartz Sandstone. Metamorphic Environment. Variable grade regional or contact metamorphism along a convergent plate boundary. Type Metamorphic Rock Texture Non-foliated; Medium-grained Composition Quartz Index Minerals Color White to off-white Miscellaneous Interlocking grains Metamorphic Type Regional or Contact Metamorphic …Quartzite rocks are found all over the world. Learn about the different types and properties of these rocks. Explore how quartzite is formed, where it is found, and the minerals in …Jun 22, 2019 · Here are some of those precious varieties: Clear, colorless quartz is called rock crystal. Translucent white quartz is called milky quartz. Milky pink quartz is called rose quartz. Its color is thought to be due to various impurities (titanium, iron, manganese) or microscopic inclusions of other minerals. Purple quartz is called amethyst. Following are the two types of igneous rock: Intrusive igneous rock: These rocks crystallise below the earth’s surface resulting in large crystals as the cooling takes place slowly. Diorite, granite, and pegmatite are examples of intrusive igneous rocks. Extrusive igneous rock: These rocks erupt onto the surface resulting in small crystals as ...Fairly or not, when it comes to sharks, most people associate them with the “eaters” more than the “eaten.” Not Europeans. And the meat of one type of shark, the Atlantic spiny dogfish, is a particular favorite. It’s used in fish and chips ...Quartzite is a type of rock. It forms when sandstone is changed by high temperature and pressure. Quartzite is used to make floors, roofs, and kitchen counters in some parts of the world. By Luna Diorite is a grey to a dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), biotite, hornblende, …The major types of metamorphic rocks are detailed here, which include regional, contact and mechanical metamorphism. ... Quartzite is a tough stone composed mostly of quartz. It may be derived from …Animal feed also contains some limestone. Gneiss. Gneiss is a type of metamorphic rock that forms when a sedimentary or igneous rock is exposed to extreme ...Quartz Sandstone. Metamorphic Environment. Variable grade regional or contact metamorphism along a convergent plate boundary. Type Metamorphic Rock Texture Non-foliated; Medium-grained Composition Quartz Index Minerals Color White to off-white Miscellaneous Interlocking grains Metamorphic Type Regional or Contact Metamorphic Grade Variable ... Definition of quartzite. Let’s now see what type of rock is quartzite by answering the first question: is quartzite foliated or nonfoliated? Quartzite mineral is a non-foliate …jqaf Quartzite - Wikipedia Quartzite Rock Type, Composition, Formation, … ... Quartzite Quartzite is a metamorphic rock formed when quartz-rich sandstone or ...Sioux Quartzite at Sioux Falls, South Dakota Cross-bedding in the Sioux Quartzite, Blue Mounds State Park, Minnesota, USA.. The Sioux Quartzite is a Proterozoic quartzite that is found in the region around the intersection of Minnesota, South Dakota, and Iowa, and correlates with other rock units throughout the upper midwestern and southwestern United States.Granite, sandstone, basalt, quartzite, and limestone are 5 different types of rock you can find for climbing. They all have different qualities and properties when it comes to climbing. Granite climbs can be extremely good for climbing or very painful and are made from igneous rock. They often contain cracks, while having smooth slabs of rock ...Animal feed also contains some limestone. Gneiss. Gneiss is a type of metamorphic rock that forms when a sedimentary or igneous rock is exposed to extreme ...Sep 6, 2020 · Rock crystal is a term for the purest form of quartz that is colorless. Rock crystal is the iconic type of quartz that looks something like ice. In fact, the Ancient Greek word for quartz was krustallos meaning "icy cold" because it was believed to be supercooled ice. Quartzite is a nonfoliated metamorphic rock that consists mostly of quartz. It's usually a white to pale gray rock, but occurs in other colors, including red and pink (from iron oxide), yellow, blue, green, and orange. The rock has a grainy surface with a sandpaper texture, but polishes to a glassy shine. Key Takeaways: Quartzite RockQuartz Sandstone. Metamorphic Environment. Variable grade regional or contact metamorphism along a convergent plate boundary. Type Metamorphic Rock Texture Non-foliated; Medium-grained Composition Quartz Index Minerals Color White to off-white Miscellaneous Interlocking grains Metamorphic Type Regional or Contact Metamorphic Grade Variable ...Quartz is a major component of many types of rock. Quartz is abundant in certain igneous rocks. It forms the clear to grey or even white lumpy blobs in granite and comprise most of silicate-rich or felsic igneous rocks. It is absent or rare in more primitive basic or silica-poor igneous rocks such as basalt.Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye. It forms from the slow crystallization of magma below Earth's surface. Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles, and other minerals. This mineral composition usually gives granite a red, pink, gray ...rocks that are formed when magma solidifies along with other rocks below the earth's surface. Diorite. coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende, and sometimes quartz. Gabbro. coarse-grained, dark-colored, intrusive igneous rock that contains feldspar, pyroxene, and sometimes olivine. Granite.Quartzite. Quartzite is a metamorphic rock that forms when sandstone is exposed to heat and pressure. It is usually white or light-colored but can also be pink, red, or gray. You’ll often find it near waterfalls or in areas with recent erosion. At Joshua Tree, it can be found in the Cottonwood Springs and Ryan Mountain areas.Quartzite. Often called the “granite that looks like marble,” its durability and performance can range from that of a marble to granite, depending on the mineral content. Typically performs like granite but in some cases its composition can allow it to scratch, stain, or etch. Overview: Quartzite, which is predominantly silica, is a hard ... Some of the rocks that are commonly tumbled nicely are jasper, agate, moonstone, laps lazuli, obsidian, petrified wood, amethyst, tiger’s eye, or other varieties of quartz. However, not every type of rock is suitable for tumbling. As a beginner, it is better to stick to quartz and agates.Quartzite, sandstone that has been converted into a solid quartz rock, free from pores and possessing a smooth fracture. Quartzite, when struck, breaks through, not around, the sand grains. The conversion of sandstone to quartzite may occur by precipitation of silica from interstitial waters below Earth's surface.With high quartz composition, and a high level on the hardness scale, the term Quartzite is befitting of this metamorphic rock. Quartzite is formed out of ...Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye. It forms from the slow crystallization of magma below Earth's surface. Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles, and other minerals. This mineral composition usually gives granite a red, pink, gray ... If only looking at rock samples in a laboratory, one can be sure of the type of metamorphism that produced a foliated metamorphic rock such as schist or gneiss, or a hornfels, which is unfoliated, but one cannot be sure of …Metamorphism & Metamorphic Rocks Learn with flashcards, games, and more — for free. ... Quartzite is composed of the mineral quartz; marble is composed of the mineral calcite. ... One type of non-foliated metamorphic rock is _____. quartzite. A metamorphic rock whose parent rock was a limestone is referred to as _____. marble.It is a metamorphic rock, which is the result of countless years of geologic pressures transforming rocks into what we see today. Quartzite benchtops are ...Question is ⇒ Quartzite is a., Options are ⇒ (A) metamorphic rock, (B) argillaceous rock, (C) calcareous rock, (D) silicious rock, (E) , Leave your ...Rose quartz is a type of quartz that exhibits a pale pink to rose red hue. The color is usually considered as due to trace amounts of titanium , iron , or manganese in the material. Some rose quartz contains microscopic rutile needles that produce asterism in transmitted light.Quartzite is formed from sandstone that has been tightly compressed to the point where the clasts have recrystallized to form a new rock. This formation ...Over time, the sand grains become compressed and stuck together to form sandstone. If the sandstone gets buried ever more deeply underneath layers of rocks, it ...What type of igneous rock is diorite? What is feldspar used for? Is gneiss a metamorphic rock? What type of igneous rock is basalt? What is a craton in geology? Which type of rock dissolves fairly easily: a. quartzite b. granite c. limestone d. basalt; Is gneiss a sedimentary rock? What is the dominant feldspar in basalt?Quartzite is a metamorphic rock, which means it used to be some other rock before it became quartzite. Quartzite's "parent rock" was sandstone. I'll give you exactly one guess what sandstone is made of. (Hint: sand) Water or wind carries sand to places like beaches, deserts, or riverbeds.Both marble and quartzite are metamorphic rocks. Their composition does change with pressure and heat but the stones do not melt. Marble, a mineral, originates from dolomite or limestone while quartzite, which is not a mineral, comes from quartz sandstone. ... Other types of marble, in particular the increasingly popular Statuario, also are ...Quartzite is a metamorphic rock made from quartz sandstone, a sedimentary rock predominantly composed of the silicate mineral quartz. The chemical composite of the quartz minerals is silicon dioxide, written SiO2. The metamorphic forces of heat and pressure force the quartz minerals to bind together and crystallize into a strong matrix.Quartzite is a natural metamorphic rock transformed from one type of rock into another over many years. Sandstone, under a natural process of heat and pressure, is fused with …Quartzite is a metamorphic rock, which means it used to be some other rock before it became quartzite. Quartzite's "parent rock" was sandstone. I'll give you exactly one guess what sandstone is made of. (Hint: sand) Water or wind carries sand to places like beaches, deserts, or riverbeds.Below are a few examples of the most popular types of metamorphic rocks. Quartzite. With its glassy gleam and granular texture, quartzite exemplifies metamorphic splendor. This decorative rock originates as pure quartz sandstone before heat and pressure transform it over millions of years. As temperatures rise, the quartz grains …The non-foliated appearance of rocks like marble and quartzite are often described as granular or sugary. Protolith rocks composed of just one mineral, for example pure limestone made of nothing but calcite, simply recystallise. In the process of doing so the calcite forms a denser rock consisting of roughly equigranular calcite crystals.Quartzite is a metamorphic rock. Hence, Option 4 is correct. The original form of Quartzite is pure quartz sandstone. It is formed when quartz-rich sandstone is exposed to high temperatures and pressures. Quartzite is mainly formed through two types of metamorphism namely Contact and Barrovian.

Differing amounts of muscovite, biotite, and hornblende -type amphiboles. Granite ( / ˈɡrænɪt /) is a coarse-grained ( phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. . Mykhailiuk

quartzite is which type of rock

Quartzite is a compact, hard, nonfoliated, medium to coarsely crystalline, and almost mono mineral metamorphic rocks with granoblastic texture. The isometric grain shape and their jagged contacts are a consequence of the process of recrystallization and loss of primary forms and contacts of grain under high pressure and high-temperature conditions.Quartz Sandstone. Metamorphic Environment. Variable grade regional or contact metamorphism along a convergent plate boundary. Type Metamorphic Rock Texture Non-foliated; Medium-grained Composition Quartz Index Minerals Color White to off-white Miscellaneous Interlocking grains Metamorphic Type Regional or Contact Metamorphic Grade Variable ... Aug 10, 2020 · Precursor to All Types of Quartzite: Sandstone. Quartzite is a metamorphic rock, which means it used to be some other rock before it became quartzite. Quartzite’s “parent rock” was sandstone. I’ll give you exactly one guess what sandstone is made of. (Hint: sand) Water or wind carries sand to places like beaches, deserts, or riverbeds. Baraboo Quartzite is a Precambrian geological formation [1] of quartzite, found in the region of Baraboo, Wisconsin. While pure quartzite is usually white or gray, Baraboo Quartzite is typically dark purple to maroon in color, due to the presence of iron ( hematite) and other impurities. [2] Baraboo Quartzite may display strata created by ... Oct 27, 2016 · Quartzite (above) is a metamorphic rock made from heating up sandstone under pressure---it fuses all those quartz sand grains together into an interlocking network of quartz. Granite, sandstone, basalt, quartzite, and limestone are 5 different types of rock you can find for climbing. They all have different qualities and properties when it comes to climbing. Granite climbs can be extremely good for climbing or very painful and are made from igneous rock. They often contain cracks, while having smooth slabs of rock ...Quartzite is a metamorphic rock derived from sandstone that is distinguished from sandstone by its fracture. Sandstone breaks along grain boundaries, whereas quartzite is so well indurated (hardened) that it breaks across constituent grains. The intense heat and pressure of metamorphism causes the quartz grains to compact and become tightly ... rocks that are formed when magma solidifies along with other rocks below the earth's surface. Diorite. coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende, and sometimes quartz. Gabbro. coarse-grained, dark-colored, intrusive igneous rock that contains feldspar, pyroxene, and sometimes olivine. Granite.1) Jasper: Jasper is our top recommendation. It is an extremely durable rock that tumbles to a very bright luster. It is colorful, inexpensive, and widely available. Note: Flint and chert are varieties of jasper. 2) Agate: Agate is another great material for the beginner to tumble.What type of rock is gneiss? What process causes igneous rock to transform into metamorphic rock? What is gneiss made of? Which silicate minerals are considered mafic, and which are felsic? What minerals make up gneiss? What are chemical sedimentary rocks? Which type of rock dissolves fairly easily: a. quartzite b. granite c. limestone d. …Adding rocks to an aquarium serves several purposes and can enhance both the aesthetic appeal and functionality of the aquarium. Rocks can create a visually appealing and natural-looking environment in the fish tank. They add texture, depth, and dimension to the aquascape, mimicking natural habitats like rivers, streams, or rocky …Quartzite is a metamorphic rock made almost entirely of the mineral quartz. Quartzite begins its geologic life as sand grains, perhaps on a beach, desert dune, or riverbed. Over time, the sand grains become …Quartz is a mineral composed of silicon and oxygen, with a chemical composition of SiO 2. It is the most abundant mineral in Earth's crust and is resistant to both chemical and physical weathering. When rocks weather away, the residual material usually contains quartz. This is why the sand at most of the world's beaches is quartz. Rose quartz is a type of quartz that exhibits a pale pink to rose red hue. The color is usually considered as due to trace amounts of titanium , iron , or manganese in the material. Some rose quartz contains microscopic rutile needles that produce asterism in transmitted light. Some types of metamorphic rocks, such as quartzite and marble, which also form in directed-pressure situations, do not necessarily exhibit foliation because ....

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