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The group of minerals that typically gives schist its strong foliation are the mica minerals, particularly biotite and muscovite. These minerals have a platy, sheet-like structure that aligns parallel to each other during the metamorphic process, resulting in the characteristic layered appearance of schist. Other minerals such as garnet and staurolite may also be present but contribute less to foliation compared to mica.
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Where does a schist rock form?
SchistMedium- to coarse-grained, mica-bearing metamorphic rock with well-developed foliation (layered structure) termed schistosity. Schist is derived primarily from fine-grained, mica-bearing rocks such as shales and slates. The schistosity is formed by rotation, recrystallization, and new growth of mica; it is deformational in origin. The planar to wavy foliation is defined by the strong preferred orientation of platy minerals, primarily muscovite, biotite, and chlorite. The relatively large grain size of these minerals (up to centimeters) produces the characteristic strong reflection when light shines on the rock.For the source and more detailed information concerning this subject, click on the related links section (Answers.com) indicated below.
What is the planar alignment of minerals due to differential stress during metamorphism?
During metamorphism, minerals align perpendicular to the direction of maximum stress, which is known as foliation. This alignment results in a planar fabric within the rock, giving it a layered appearance. The degree of alignment can vary from a weak preferred orientation to a strong and well-developed foliation.
What is schist made of?
Schist is a metamorphic rock primarily composed of minerals such as mica, chlorite, talc, and amphibole. It forms from the metamorphism of other rocks like shale or slate, resulting in a foliated texture due to the parallel alignment of its mineral grains. Schist typically has a medium to coarse-grained texture and often exhibits shiny surfaces due to the presence of mica minerals.
What are the properties of gneiss?
gneiss has many properties depending on the type of gneiss it is but some common properties are fine or coarse grains, metamorphic "bands" on the rock, and it's composition which is feldspar,quartz, mica, and hornblende.
What are the physical properties of metaconglomerate rocks?
Metaconglomerate rocks are metamorphic rocks that form from the recrystallization of conglomerate rocks under high heat and pressure. They typically have a banded appearance due to the reorientation of minerals like quartz, feldspar, and mica. Metaconglomerates often have a medium to coarse grain size and exhibit strong foliation due to the alignment of mineral grains during metamorphism.
Which mineral is responsible for the strong foliation in a schist?
The mineral responsible for the strong foliation in schist is usually mica (such as biotite or muscovite). These minerals have a planar structure that aligns during the metamorphic process, creating the foliation planes in the rock.
Is schist the same as mica schist?
No, schist is a metamorphic rock type characterized by strong foliation, while mica schist is a specific type of schist that contains a high proportion of mica minerals like muscovite or biotite. Mica schist has a distinct shiny appearance due to the abundance of mica minerals.
Where does a schist rock form?
SchistMedium- to coarse-grained, mica-bearing metamorphic rock with well-developed foliation (layered structure) termed schistosity. Schist is derived primarily from fine-grained, mica-bearing rocks such as shales and slates. The schistosity is formed by rotation, recrystallization, and new growth of mica; it is deformational in origin. The planar to wavy foliation is defined by the strong preferred orientation of platy minerals, primarily muscovite, biotite, and chlorite. The relatively large grain size of these minerals (up to centimeters) produces the characteristic strong reflection when light shines on the rock.For the source and more detailed information concerning this subject, click on the related links section (Answers.com) indicated below.
Can you describe the 4 rocks formed by metamorphic grade which are Slate Phyllite Schist and Gneiss?
Slate is a low-grade metamorphic rock characterized by fine-grained foliated structure. Phyllite is intermediate-grade metamorphic rock with a greater degree of crystallization and foliation than slate. Schist is a medium-grade metamorphic rock with visible mineral grains and strong foliation. Gneiss is a high-grade metamorphic rock with distinct banding of light and dark minerals and high crystallization.
What are the minerals in schist?
The schists constitute a group of medium-grade metamorphic rocks, chiefly notable for the preponderance of lamellar minerals such as micas, chlorite, talc, hornblende, graphite, and others. Quartz often occurs in drawn-out grains to such an extent that a particular form called quartz schist is produced. By definition, schist contains more than 50% platy and elongated minerals, often finely interleaved with quartz and feldspar.
What is the planar alignment of minerals due to differential stress during metamorphism?
During metamorphism, minerals align perpendicular to the direction of maximum stress, which is known as foliation. This alignment results in a planar fabric within the rock, giving it a layered appearance. The degree of alignment can vary from a weak preferred orientation to a strong and well-developed foliation.
What is schists?
Schist is a metamorphic rock characterized by strong foliation, or preferred orientation of minerals, giving it a banded appearance. It forms from the metamorphism of various rock types under high temperature and pressure conditions deep within the Earth's crust. Schist is commonly used in construction and as a decorative stone due to its distinctive appearance.
Which property of the gneiss sample prevented it from weathering?
The property of foliation in gneiss, caused by its alternating layers of minerals, makes it resistant to weathering. This foliation gives gneiss a strong and cohesive structure, preventing the rock from easily breaking down in response to weathering processes.
What is schist made of?
Schist is a metamorphic rock primarily composed of minerals such as mica, chlorite, talc, and amphibole. It forms from the metamorphism of other rocks like shale or slate, resulting in a foliated texture due to the parallel alignment of its mineral grains. Schist typically has a medium to coarse-grained texture and often exhibits shiny surfaces due to the presence of mica minerals.
Is a strong parallel alignment of different mineral bands in a metamorphic rock?
The strong parallel alignment of different mineral bands in a metamorphic rock is called foliation. Foliation is caused by differential stress during the rock's formation, resulting in minerals aligning perpendicular to the direction of stress to create distinct layers or bands. This alignment gives the rock a banded appearance and is a key characteristic used to classify metamorphic rocks.
What are the properties of gneiss?
gneiss has many properties depending on the type of gneiss it is but some common properties are fine or coarse grains, metamorphic "bands" on the rock, and it's composition which is feldspar,quartz, mica, and hornblende.
Why do you need protein and minerals?
We need protein and minerals to keep bones strong.
