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Schist
Schist

Pegmatite
Pegmatite



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Schist vs Pegmatite

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Definition

Definition

Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation
Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals

History

Origin

-
-

Discoverer

Unknown
R. J. Hauy

Etymology

From French schiste, Greek skhistos i.e. split
From Greek pegma, pegmat which means- thing joined together + -ite

Class

Metamorphic Rocks
Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock

Family

Group

-
Plutonic

Other Categories

Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock

Texture

Texture

Foliated, Platy
Pegmatitic

Color

Black, Blue, Brown, Dark Brown, Green, Grey, Silver
Black, Brown, Cream, Green, Grey, Pink, Red, Rust, Silver, White, Yellow

Maintenance

Less
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Layered and Shiny
Layered, Banded, Veined and Shiny

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Interior Decoration
Decorative Aggregates, Flooring, Interior Decoration

Exterior Uses

Garden Decoration, Paving Stone
As Building Stone, As Facing Stone, Paving Stone

Other Architectural Uses

-
Curbing

Industry

Construction Industry

As Dimension Stone, Building houses or walls, Cement Manufacture, for Road Aggregate, Roadstone
As Dimension Stone, Building houses or walls, Construction Aggregate, for Road Aggregate, Landscaping

Medical Industry

-
-

Antiquity Uses

Artifacts
Artifacts, Sculpture, Small Figurines

Other Uses

Commercial Uses

Used in aquariums, Writing Slates
Creating Artwork, Jewelry, Source of corundum, tourmalines, beryls and topaz

Types

Types

Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.
Granite Pegmatite, Gabbro Pegmatite and Diorite Pegmatite

Features

Easily splits into thin plates, Smooth to touch
Generally rough to touch, Is one of the oldest rock, Source of corundum, tourmalines, beryls and topaz

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Absent

Formation

Formation

Schist formed by dynamic metamorphism at high temperatures and pressures that aligns the grains of mica, hornblende and other elongated minerals into thin layers.
Pegmatite rock is holocrystalline, intrusive igneous rock which is formed by partial melting and dewatering during the process of metamorphism.

Composition

Mineral Content

Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc
Apatite, Beryl, Feldspar, Fluorite, Garnet, Lepidolite, Quartz, Silica, Spodumene, Topaz

Compound Content

CaO, Carbon Dioxide, MgO
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, Magnesium Carbonate, MgO, Phosphorus Pentoxide

Transformation

Metamorphism

Types of Metamorphism

-
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

3.5-47
1 7
👆🏻

Grain Size

Medium to Fine Coarse Grained
Medium to Coarse Grained

Fracture

Conchoidal
Conchoidal

Streak

White
White

Porosity

Highly Porous
Less Porous

Luster

Shiny
Grainy, Pearly and Vitreous

Compressive Strength

150.00 N/mm2178.54 N/mm2
0.15 450
👆🏻

Cleavage

Slaty
Perfect

Toughness

1.5
2.1

Specific Gravity

2.5-2.92.6-2.63
0 8.4
👆🏻

Transparency

Opaque
Translucent to Opaque

Density

2.8-2.9 g/cm32.6-2.65 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.70 kJ/Kg K0.79 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Impact Resistant, Pressure Resistant, Water Resistant
Heat Resistant, Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Bangladesh, Bhutan, China, India, Japan, Kazakhstan, Malaysia, Pakistan, Russia, Thailand, Turkey, Vietnam
China, India, Iran, Japan, Nepal, North Korea, Russia, Saudi Arabia, South Korea

Africa

Egypt, Ethiopia, Morocco, Nigeria, South Africa
South Africa

Europe

Austria, England, France, Georgia, Germany, Italy, Liechtenstein, Monaco, Norway, Slovenia, Spain, Sweden, Switzerland
Austria, France, Greece, Ireland, Italy, Netherlands, Slovakia, Spain, Turkey, Ukraine

Others

-
-

Deposits in Western Continents

North America

Canada, Costa Rica, Cuba, Mexico, Panama, USA
Canada

South America

Brazil, Colombia, Guyana
Brazil

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Queensland
New South Wales, Queensland, South Australia, Western Australia

Schist vs Pegmatite Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Schist and Pegmatite Reserves. Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation. Pegmatite rock is a holocrystalline, intrusive igneous rock which is composed of interlocking phaneritic crystals. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Schist vs Pegmatite information and Schist vs Pegmatite characteristics in the upcoming sections.

Schist vs Pegmatite Characteristics

Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Schist vs Pegmatite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Schist and Properties of Pegmatite. Learn more about Schist vs Pegmatite in the next section. The interior uses of Schist include Decorative aggregates, Floor tiles and Interior decoration whereas the interior uses of Pegmatite include Decorative aggregates, Flooring and Interior decoration. Due to some exceptional properties of Schist and Pegmatite, they have various applications in construction industry. The uses of Schist in construction industry include As dimension stone, Building houses or walls, Cement manufacture, For road aggregate, Roadstone and that of Pegmatite include As dimension stone, Building houses or walls, Construction aggregate, For road aggregate, Landscaping.

More about Schist and Pegmatite

Here you can know more about Schist and Pegmatite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Schist and Pegmatite consists of mineral content and compound content. The mineral content of Schist includes Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc and mineral content of Pegmatite includes Apatite, Beryl, Feldspar, Fluorite, Garnet, Lepidolite, Quartz, Silica, Spodumene, Topaz. You can also check out the list of all Metamorphic Rocks. When we have to compare Schist vs Pegmatite, the texture, color and appearance plays an important role in determining the type of rock. Schist is available in black, blue, brown, dark brown, green, grey, silver colors whereas, Pegmatite is available in black, brown, cream, green, grey, pink, red, rust, silver, white, yellow colors. Appearance of Schist is Layered and Shiny and that of Pegmatite is Layered, Banded, Veined and Shiny. Properties of rock is another aspect for Schist vs Pegmatite. The hardness of Schist is 3.5-4 and that of Pegmatite is 7. The types of Schist are Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist. whereas types of Pegmatite are Granite Pegmatite, Gabbro Pegmatite and Diorite Pegmatite. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Schist and Pegmatite is white. The specific heat capacity of Schist is 0.70 kJ/Kg K and that of Pegmatite is 0.79 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Schist is impact resistant, pressure resistant, water resistant whereas Pegmatite is heat resistant, impact resistant, pressure resistant.