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Schist and Mylonite


Mylonite and Schist


Definition

Definition
Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation   
Mylonite is a metamorphic rock formed by ductile deformation during intense shearing encountered during folding and faulting, a process termed cataclastic or dynamic metamorphism   

History
  
  

Origin
Unknown   
New Zealand   

Discoverer
Unknown   
Unknown   

Etymology
From French schiste, Greek skhistos i.e. split   
From Greek mulōn mill + -ite   

Class
Metamorphic Rocks   
Metamorphic Rocks   

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

Family
  
  

Group
Not Applicable   
Not Applicable   

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

Texture

Texture
Foliated, Platy   
Foliated   

Color
Black, Blue, Brown, Dark Brown, Green, Grey, Silver   
Black to 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, Banded and Foilated   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Not Yet Used   
Curbing   

Industry
  
  

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

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts, Monuments   

Other Uses
  
  

Commercial Uses
Used in aquariums, Writing Slates   
Creating Artwork, Gemstone, Jewelry   

Types

Types
Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.   
Blastomylonites, Ultramylonites and Phyllonites   

Features
Easily splits into thin plates, Smooth to touch   
Surfaces are often shiny   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Used   

Famous Monuments
Not Applicable   
Data Not Available   

Sculpture
Not Yet Used   
Used   

Famous Sculptures
Not Applicable   
Data Not Available   

Pictographs
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Not Yet Used   
Used   

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.   
Mylonites are ductilely deformed rocks formed by the accumulation of large shear strain, in ductile fault zones.   

Composition
  
  

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

Compound Content
CaO, Carbon Dioxide, MgO   
Aluminium Oxide, Calcium Sulfate, Chromium(III) Oxide, Iron(III) Oxide, Magnesium Carbonate, Silicon Dioxide   

Transformation
  
  

Metamorphism
No   
No   

Types of Metamorphism
Not Applicable   
Not Applicable   

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, Sea Erosion, Wind Erosion   

Properties

Physical Properties
  
  

Hardness
3.5-4   
3-4   

Grain Size
Medium to Fine Coarse Grained   
Fine Grained   

Fracture
Conchoidal   
Conchoidal   

Streak
White   
White   

Porosity
Highly Porous   
Highly Porous   

Luster
Shiny   
Shiny   

Compressive Strength
Not Available   
1.28 N/mm2   
32

Cleavage
Slaty   
Conchoidal   

Toughness
1.5   
Not Available   

Specific Gravity
2.5-2.9   
2.97-3.05   

Transparency
Opaque   
Opaque   

Density
2.8-2.9 g/cm3   
2.6-4.8 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
1.50 kJ/Kg K   
3

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, Indonesia, Saudi Arabia, South Korea   

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

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

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

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

South America
Brazil, Colombia, Guyana   
Not Yet Found   

Deposits in Oceania Continent
  
  

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

Summary >>
<< Reserves

All about Schist and Mylonite Properties

Know all about Schist and Mylonite properties here. All properties of rocks are important as they define the type of rock and its application. Schist and Mylonite belong to Metamorphic Rocks.Texture of Schist is Foliated, Platy whereas that of Mylonite is Foliated. Schist appears Layered and Shiny and Mylonite appears Dull, Banded and Foilated. The luster of Schist and Mylonite is shiny. Schist is available in black, blue, brown, dark brown, green, grey, silver colors whereas Mylonite is available in black to grey colors. The commercial uses of Schist are used in aquariums, writing slates and that of Mylonite are creating artwork, gemstone, jewelry.

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