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Scoria and Schist


Schist and Scoria


Definition

Definition
Scoria is a dark-colored extrusive igneous rock with abundant round bubble-like cavities   
Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation   

History
  
  

Discoverer
Unknown   
Unknown   

Etymology
From late Middle English (denoting slag from molten metal), from Greek skōria refuse, from skōr dung   
From French schiste, Greek skhistos i.e. split   

Class
Igneous Rocks   
Metamorphic Rocks   

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

Family
  
  

Group
Volcanic   
Not Applicable   

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

Texture

Texture
Vesicular   
Foliated, Platy   

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

Maintenance
More   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
No   

Stain Resistant
No   
No   

Wind Resistant
No   
No   

Acid Resistant
No   
No   

Appearance
Glassy and Vesicular   
Layered and Shiny   

Uses

Architecture
  
  

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

Exterior Uses
Garden Decoration, Paving Stone   
Garden Decoration, Paving Stone   

Other Architectural Uses
Curbing   
Not Yet Used   

Industry
  
  

Construction Industry
Cement Manufacture, Construction Aggregate, for Road Aggregate, In landscaping and drainage works   
As Dimension Stone, Building houses or walls, Cement Manufacture, for Road Aggregate, Roadstone   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments, Sculpture   
Artifacts   

Other Uses
  
  

Commercial Uses
As a traction material on snow-covered roads, Creating Artwork, High-temperature insulation, In gas barbecue grills   
Used in aquariums, Writing Slates   

Types

Types
Not Available   
Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.   

Features
Available in Lots of Colors and Patterns, Generally rough to touch, Surfaces are often shiny   
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
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
Scoria forms when magma containing huge amount of dissolved gas flows from a volcano during an eruption.   
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
Apatite, Biotite, Calcite, Feldspar, Hematite, Hornblade, Ilmenite, Magnetite, Olivine, Pyroxene, Quartz, Silica   
Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc   

Compound Content
Ca, NaCl   
CaO, Carbon Dioxide, MgO   

Transformation
  
  

Metamorphism
Yes   
No   

Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism   
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, Coastal Erosion, Glacier Erosion   

Properties

Physical Properties
  
  

Hardness
5-6   
3.5-4   

Grain Size
Fine Grained   
Medium to Fine Coarse Grained   

Fracture
Conchoidal   
Conchoidal   

Streak
White   
White   

Porosity
Highly Porous   
Highly Porous   

Luster
Subvitreous to Dull   
Shiny   

Cleavage
Perfect   
Slaty   

Toughness
2.1   
1.5   

Specific Gravity
Not Available   
2.5-2.9   

Transparency
Opaque   
Opaque   

Density
Not Available   
2.8-2.9 g/cm3   

Thermal Properties
  
  

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

Reserves

Deposits in Eastern Continents
  
  

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

Africa
Ethiopia, Kenya, Tanzania   
Egypt, Ethiopia, Morocco, Nigeria, South Africa   

Europe
Greece, Hungary, Iceland, Italy, Turkey   
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
Bahamas, Barbados, Canada, Costa Rica, Cuba, Jamaica, Mexico, USA   
Canada, Costa Rica, Cuba, Mexico, Panama, USA   

South America
Argentina, Chile, Ecuador, Peru   
Brazil, Colombia, Guyana   

Deposits in Oceania Continent
  
  

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

Summary >>
<< Reserves

All about Scoria and Schist Properties

Know all about Scoria and Schist properties here. All properties of rocks are important as they define the type of rock and its application. Scoria belongs to Igneous Rocks while Schist belongs to Metamorphic Rocks.Texture of Scoria is Vesicular whereas that of Schist is Foliated, Platy. Scoria appears Glassy and Vesicular and Schist appears Layered and Shiny. The luster of Scoria is subvitreous to dull while that of Schist is shiny. Scoria is available in black, brown, dark grey to black, red colors whereas Schist is available in black, blue, brown, dark brown, green, grey, silver colors. The commercial uses of Scoria are as a traction material on snow-covered roads, creating artwork, high-temperature insulation, in gas barbecue grills and that of Schist are used in aquariums, writing slates.

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