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Greenschist and Greywacke


Greywacke and Greenschist


Definition

Definition
Greenschist is a metamorphic rock that is formed under lowest temperatures and pressures and is usually produced by regional metamorphism   
Greywacke is defined as a dark coarse-grained sandstone rock which contains more than 15 per cent clay   

History
  
  

Discoverer
Unknown   
Unknown   

Etymology
From minerals such as chlorite, serpentine, and epidote, and platy minerals such as muscovite and platy serpentine which are green in color   
From German Grauwacke, from grau grey + wacke   

Class
Metamorphic Rocks   
Sedimentary Rocks   

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

Color
Dark Greenish - Grey, Green   
Beige, Black, Brown, Colourless, Cream, Dark Brown, Green, Grey, Light Green, Light to Dark Grey, Pink, Red, White, Yellow   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
Yes   

Wind Resistant
No   
Yes   

Acid Resistant
No   
No   

Appearance
Layered and Shiny   
Dull   

Uses

Architecture
  
  

Interior Uses
Bathrooms, Countertops, Decorative Aggregates, Entryways, Homes, Interior Decoration   
Decorative Aggregates, Floor Tiles, Flooring, Homes, Interior Decoration   

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

Other Architectural Uses
Curbing   
Curbing, Whetstones   

Industry
  
  

Construction Industry
As Dimension Stone, Building houses or walls, Cement Manufacture, Cutting Tool, for Road Aggregate, Roadstone   
Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Raw material for the manufacture of mortar   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts, Sculpture, Small Figurines   

Other Uses
  
  

Commercial Uses
Blackboards, Manufacture of tools, Writing Slates   
As armour rock for sea walls, Petroleum reservoirs, Sea Defence, Tombstones   

Types

Types
Not Available   
Not Available   

Features
Easily splits into thin plates, Smooth to touch   
Available in Lots of Colors and Patterns, Generally rough to touch, Non-vesicular, Veined   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Not Yet Used   

Famous Monuments
Not Applicable   
Not Applicable   

Sculpture
Not Yet Used   
Used   

Famous Sculptures
Not Applicable   
Data Not Available   

Pictographs
Used   
Not Used   

Petroglyphs
Used   
Not Used   

Figurines
Not Yet Used   
Used   

Fossils
Absent   
Present   

Formation

Formation
Greenschist is medium grade metamorphic rock, formed by the metamorphosis of mudstone or shale, or some types of igneous rock, when it is subjected to higher temperatures and pressures.   
Graywacke rock is a type of sedimentary rock, which is also known as immature sandstone, which is indurated, dark grey and consisting of poorly sorted angular to sub-angular, sand-sized grains.   

Composition
  
  

Mineral Content
Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Serpentine, Sillimanite, Staurolite, Talc   
Augite, Biotite, Calcite, Chlorite, Clay, Clay Minerals, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyroxene, Quartz   

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

Transformation
  
  

Metamorphism
No   
No   

Types of Metamorphism
Not Applicable   
Not Applicable   

Weathering
Yes   
Yes   

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

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
3.5-4   
6-7   

Grain Size
Medium to Fine Coarse Grained   
Angular and Fine   

Fracture
Conchoidal   
Conchoidal   

Streak
White   
White   

Porosity
Highly Porous   
Highly Porous   

Luster
Shiny   
Dull   

Cleavage
Slaty   
Perfect   

Toughness
1.5   
2.6   

Specific Gravity
2.5-2.9   
2.2-2.8   

Transparency
Opaque   
Opaque   

Density
2.8-2.9 g/cm3   
2.6-2.61 g/cm3   

Thermal Properties
  
  

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, Kazakhstan, Mongolia, Russia, Uzbekistan   

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

Europe
Austria, England, France, Georgia, Germany, Italy, Liechtenstein, Monaco, Norway, Slovenia, Spain, Sweden, Switzerland   
Austria, Denmark, Germany, Great Britain, Netherlands, Norway, Poland, Sweden, Switzerland, United Kingdom   

Others
Not Yet Found   
Greenland   

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   
New South Wales, New Zealand   

Summary >>
<< Reserves

All about Greenschist and Greywacke Properties

Know all about Greenschist and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Greenschist belongs to Metamorphic Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Greenschist is Foliated, Platy whereas that of Greywacke is Clastic. Greenschist appears Layered and Shiny and Greywacke appears Dull. The luster of Greenschist is shiny while that of Greywacke is dull. Greenschist is available in dark greenish - grey, green colors whereas Greywacke is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. The commercial uses of Greenschist are blackboards, manufacture of tools, writing slates and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.

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