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Schist vs Trachyandesite


Trachyandesite vs Schist


Definition

Definition
Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation  
Trachyandesite is an extrusive igneous rock.  

History
  
  

Origin
-  
Indonesia  

Discoverer
Unknown  
Unknown  

Etymology
From French schiste, Greek skhistos i.e. split  
From French trachyandésite, trachy + andésite andesite, a lava intermediate in composition between trachyte and andesite  

Class
Metamorphic Rocks  
Igneous Rocks  

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

Family
  
  

Group
-  
Volcanic  

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

Texture

Texture
Foliated, Platy  
Glassy, Massive, Porphyritic, Scoriaceous, Vesicular  

Color
Black, Blue, Brown, Dark Brown, Green, Grey, Silver  
Black, Brown, Light to Dark Grey  

Maintenance
Less  
Less  

Durability
Durable  
Durable  

Water Resistant
Yes  
Yes  

Scratch Resistant
No  
Yes  

Stain Resistant
No  
No  

Wind Resistant
No  
No  

Acid Resistant
No  
No  

Appearance
Layered and Shiny  
Dull and Soft  

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Floor Tiles, Interior Decoration  
Countertops, Decorative Aggregates, Homes, Interior Decoration  

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

Other Architectural Uses
-  
Curbing  

Industry
  
  

Construction Industry
As Dimension Stone, Building houses or walls, Cement Manufacture, for Road Aggregate, Roadstone  
Building houses or walls, Cobblestones, for Road Aggregate, Rail Track Ballast, Roadstone  

Medical Industry
-  
-  

Antiquity Uses
Artifacts  
Artifacts, Sculpture  

Other Uses
  
  

Commercial Uses
Used in aquariums, Writing Slates  
Creating Artwork, Pottery  

Types

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

Features
Easily splits into thin plates, Smooth to touch  
Has High structural resistance against erosion and climate, Very fine grained rock  

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.  
Trachyandesite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.  

Composition
  
  

Mineral Content
Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc  
Alkali feldspar, Biotite, Olivine, Plagioclase, Pyroxene, Sodic plagioclase  

Compound Content
CaO, Carbon Dioxide, MgO  
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide  

Transformation
  
  

Metamorphism
No  
Yes  

Types of Metamorphism
-  
Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism  

Weathering
Yes  
Yes  

Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering  
Biological Weathering, Chemical Weathering, Mechanical Weathering  

Erosion
Yes  
Yes  

Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion  
Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion  

Properties

Physical Properties
  
  

Hardness
3.5-4  
4-5  

Grain Size
Medium to Fine Coarse Grained  
Fine Grained  

Fracture
Conchoidal  
Conchoidal  

Streak
White  
Light to dark brown  

Porosity
Highly Porous  
Less Porous  

Luster
Shiny  
Earthy  

Compressive Strength
150.00 N/mm2  
22
37.40 N/mm2  
99+

Cleavage
Slaty  
Perfect  

Toughness
1.5  
2.3  

Specific Gravity
2.5-2.9  
2.8-3  

Transparency
Opaque  
Opaque  

Density
2.8-2.9 g/cm3  
2.9-3.1 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
0.70 kJ/Kg K  
24
0.84 kJ/Kg K  
15

Resistance
Impact Resistant, Pressure Resistant, Water Resistant  
Heat Resistant, Pressure Resistant, Wear Resistant  

Reserves

Deposits in Eastern Continents
  
  

Asia
Afghanistan, Bangladesh, Bhutan, China, India, Japan, Kazakhstan, Malaysia, Pakistan, Russia, Thailand, Turkey, Vietnam  
India, Russia  

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

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

Others
-  
-  

Deposits in Western Continents
  
  

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

South America
Brazil, Colombia, Guyana  
Brazil  

Deposits in Oceania Continent
  
  

Australia
New South Wales, New Zealand, Queensland  
-  

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Schist vs Trachyandesite 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 Trachyandesite Reserves. Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation. Trachyandesite is an extrusive igneous rock.. 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 Trachyandesite information and Schist vs Trachyandesite characteristics in the upcoming sections.

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Schist vs Trachyandesite 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 Trachyandesite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Schist and Properties of Trachyandesite. Learn more about Schist vs Trachyandesite in the next section. The interior uses of Schist include Decorative aggregates, Floor tiles and Interior decoration whereas the interior uses of Trachyandesite include Countertops, Decorative aggregates, Homes and Interior decoration. Due to some exceptional properties of Schist and Trachyandesite, 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 Trachyandesite include Building houses or walls, Cobblestones, For road aggregate, Rail track ballast, Roadstone.

More about Schist and Trachyandesite

Here you can know more about Schist and Trachyandesite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Schist and Trachyandesite 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 Trachyandesite includes Alkali feldspar, Biotite, Olivine, Plagioclase, Pyroxene, Sodic plagioclase. You can also check out the list of all Metamorphic Rocks. When we have to compare Schist vs Trachyandesite, 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, Trachyandesite is available in black, brown, light to dark grey colors. Appearance of Schist is Layered and Shiny and that of Trachyandesite is Dull and Soft. Properties of rock is another aspect for Schist vs Trachyandesite. The hardness of Schist is 3.5-4 and that of Trachyandesite is 4-5. 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 Trachyandesite are Basaltic Trachyandesite. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Schist is white while that of Trachyandesite is light to dark brown. The specific heat capacity of Schist is 0.70 kJ/Kg K and that of Trachyandesite is 0.84 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 Trachyandesite is heat resistant, pressure resistant, wear resistant.

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