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Skarn vs Schist


Schist vs Skarn


Definition

Definition
Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin   
Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation   

History
  
  

Origin
USA, Australia   
Unknown   

Discoverer
Tornebohm   
Unknown   

Etymology
From an old Swedish mining term originally used to describe a type of silicate gangue or waste rock.   
From French schiste, Greek skhistos i.e. split   

Class
Metamorphic Rocks   
Metamorphic Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Medium Hardness Rock   

Family
  
  

Group
Not Applicable   
Not Applicable   

Other Categories
Fine Grained Rock, Opaque Rock   
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock   

Texture

Texture
Earthy, Mud-rich, Rough   
Foliated, Platy   

Color
Black, Brown, Colourless, Green, Grey, White   
Black, Blue, Brown, Dark Brown, Green, Grey, Silver   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
No   

Stain Resistant
No   
No   

Wind Resistant
Yes   
No   

Acid Resistant
Yes   
No   

Appearance
Dull   
Layered and Shiny   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Entryways, Interior Decoration   
Decorative Aggregates, Floor Tiles, Interior Decoration   

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

Other Architectural Uses
Curbing   
Not Yet Used   

Industry
  
  

Construction Industry
As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Gold and Silver production, Manufacture of Magnesium and Dolomite Refractories   
As Dimension Stone, Building houses or walls, Cement Manufacture, for Road Aggregate, Roadstone   

Medical Industry
Not Applicable   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments, Sculpture   
Artifacts   

Other Uses
  
  

Commercial Uses
Creating Artwork, Gemstone, Jewelry, Metallurgical Flux, Source of Magnesia (MgO)   
Used in aquariums, Writing Slates   

Types

Types
Endoskarns   
Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.   

Features
Host Rock for Lead, Zinc and Copper Deposits   
Easily splits into thin plates, Smooth to touch   

Archaeological Significance
  
  

Monuments
Used   
Not Yet Used   

Famous Monuments
Data Not Available   
Not Applicable   

Sculpture
Used   
Not Yet Used   

Famous Sculptures
Data Not Available   
Not Applicable   

Pictographs
Not Used   
Used   

Petroglyphs
Not Used   
Used   

Figurines
Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Skarn is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.   
Schist formed by dynamic metamorphism at high temperatures and pressures that aligns the grains of mica, hornblende and other elongated minerals into thin layers.   

Composition
  
  

Mineral Content
Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite   
Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc   

Compound Content
Au, CaO, Carbon Dioxide, Cu, Fe, MgO   
CaO, Carbon Dioxide, MgO   

Transformation
  
  

Metamorphism
Yes   
No   

Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism   
Not Applicable   

Weathering
No   
Yes   

Types of Weathering
Not Applicable   
Biological Weathering, Chemical Weathering, Mechanical Weathering   

Erosion
No   
Yes   

Types of Erosion
Not Applicable   
Chemical Erosion, Coastal Erosion, Glacier Erosion   

Properties

Physical Properties
  
  

Hardness
6.5   
3.5-4   

Grain Size
Fine Grained   
Medium to Fine Coarse Grained   

Fracture
Irregular   
Conchoidal   

Streak
Light to dark brown   
White   

Porosity
Less Porous   
Highly Porous   

Luster
Waxy and Dull   
Shiny   

Cleavage
Slaty   
Slaty   

Toughness
2.4   
1.5   

Specific Gravity
2.86   
2.5-2.9   

Transparency
Opaque   
Opaque   

Density
2.8-2.9 g/cm3   
2.8-2.9 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
0.92 kJ/Kg K   
10
Not Available   

Resistance
Heat Resistant   
Impact Resistant, Pressure Resistant, Water Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India, Russia, Saudi Arabia, South Korea, Sri Lanka   
Afghanistan, Bangladesh, Bhutan, China, India, Japan, Kazakhstan, Malaysia, Pakistan, Russia, Thailand, Turkey, Vietnam   

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

Europe
United Kingdom   
Austria, England, France, Georgia, Germany, Italy, Liechtenstein, Monaco, Norway, Slovenia, Spain, Sweden, Switzerland   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

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

South America
Brazil, Colombia, Paraguay   
Brazil, Colombia, Guyana   

Deposits in Oceania Continent
  
  

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

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Skarn vs Schist 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 Skarn and Schist Reserves. Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin. Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation. 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 Skarn vs Schist information and Skarn vs Schist characteristics in the upcoming sections.

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Skarn vs Schist 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. Skarn vs Schist characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Skarn and Properties of Schist. Learn more about Skarn vs Schist in the next section. The interior uses of Skarn include Decorative aggregates, Entryways and Interior decoration whereas the interior uses of Schist include Decorative aggregates, Floor tiles and Interior decoration. Due to some exceptional properties of Skarn and Schist, they have various applications in construction industry. The uses of Skarn in construction industry include As a flux in the production of steel and pig iron, As a sintering agent in steel industry to process iron ore, As dimension stone, Gold and silver production, Manufacture of magnesium and dolomite refractories and that of Schist include As dimension stone, Building houses or walls, Cement manufacture, For road aggregate, Roadstone.

More about Skarn and Schist

Here you can know more about Skarn and Schist. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Skarn and Schist consists of mineral content and compound content. The mineral content of Skarn includes Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite and mineral content of Schist includes Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc. You can also check out the list of all Metamorphic Rocks. When we have to compare Skarn vs Schist, the texture, color and appearance plays an important role in determining the type of rock. Skarn is available in black, brown, colourless, green, grey, white colors whereas, Schist is available in black, blue, brown, dark brown, green, grey, silver colors. Appearance of Skarn is Dull and that of Schist is Layered and Shiny. Properties of rock is another aspect for Skarn vs Schist. The hardness of Skarn is 6.5 and that of Schist is 3.5-4. The types of Skarn are Endoskarns whereas types of Schist are Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Skarn is light to dark brown while that of Schist is white. The specific heat capacity of Skarn is 0.92 kJ/Kg K and that of Schist is Not Available. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Skarn is heat resistant whereas Schist is impact resistant, pressure resistant, water resistant.

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