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Obsidian vs Schist


Schist vs Obsidian


Definition

Definition
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth  
Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation  

History
  
  

Origin
Ethiopia  
-  

Discoverer
Obsius  
Unknown  

Etymology
From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius  
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  
-  

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

Texture

Texture
Glassy  
Foliated, Platy  

Color
Black, Blue, Brown, Green, Orange, Red, Tan, Yellow  
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
No  
No  

Acid Resistant
No  
No  

Appearance
Shiny  
Layered and Shiny  

Uses

Architecture
  
  

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

Exterior Uses
Garden Decoration  
Garden Decoration, Paving Stone  

Other Architectural Uses
-  
-  

Industry
  
  

Construction Industry
Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points  
As Dimension Stone, Building houses or walls, Cement Manufacture, for Road Aggregate, Roadstone  

Medical Industry
Surgery  
-  

Antiquity Uses
Artifacts, Jewellery  
Artifacts  

Other Uses
  
  

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

Types

Types
Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian  
Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.  

Features
Blocks negativity, Helps to protect against depression  
Easily splits into thin plates, Smooth to touch  

Archaeological Significance
  
  

Monuments
-  
-  

Famous Monuments
-  
-  

Sculpture
-  
-  

Famous Sculptures
-  
-  

Pictographs
-  
-  

Petroglyphs
-  
-  

Figurines
-  
-  

Fossils
Absent  
Absent  

Formation

Formation
When the lava is released from volcano, it undergoes a very rapid cooling which freezes the mechanisms of crystallization. The result is a volcanic glass with a uniform smooth texture.  
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
-  
Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc  

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

Transformation
  
  

Metamorphism
Yes  
No  

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

Properties

Physical Properties
  
  

Hardness
5-5.5  
3.5-4  

Grain Size
-  
Medium to Fine Coarse Grained  

Fracture
Conchoidal  
Conchoidal  

Streak
White  
White  

Porosity
Very Less Porous  
Highly Porous  

Luster
Vitreous  
Shiny  

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

Cleavage
-  
Slaty  

Toughness
-  
1.5  

Specific Gravity
2.6-2.7  
2.5-2.9  

Transparency
Translucent  
Opaque  

Density
2.6 g/cm3  
2.8-2.9 g/cm3  

Thermal Properties
  
  

Specific Heat Capacity
0.92 kJ/Kg K  
10
0.70 kJ/Kg K  
24

Resistance
Heat Resistant, Impact 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
Kenya  
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
-  
-  

Deposits in Western Continents
  
  

North America
Canada, 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  
New South Wales, New Zealand, Queensland  

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Obsidian 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 Obsidian and Schist Reserves. Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. 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 Obsidian vs Schist information and Obsidian vs Schist characteristics in the upcoming sections.

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Obsidian 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. Obsidian vs Schist characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Obsidian and Properties of Schist. Learn more about Obsidian vs Schist in the next section. The interior uses of Obsidian include Decorative aggregates and Interior decoration whereas the interior uses of Schist include Decorative aggregates, Floor tiles and Interior decoration. Due to some exceptional properties of Obsidian and Schist, they have various applications in construction industry. The uses of Obsidian in construction industry include Arrowheads, Cutting tool, Knives, Scrapers, Spear points and that of Schist include As dimension stone, Building houses or walls, Cement manufacture, For road aggregate, Roadstone.

More about Obsidian and Schist

Here you can know more about Obsidian and Schist. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Obsidian and Schist consists of mineral content and compound content. The mineral content of Obsidian includes 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 Igneous Rocks. When we have to compare Obsidian vs Schist, the texture, color and appearance plays an important role in determining the type of rock. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas, Schist is available in black, blue, brown, dark brown, green, grey, silver colors. Appearance of Obsidian is Shiny and that of Schist is Layered and Shiny. Properties of rock is another aspect for Obsidian vs Schist. The hardness of Obsidian is 5-5.5 and that of Schist is 3.5-4. The types of Obsidian are Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian 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 Obsidian and Schist is white. The specific heat capacity of Obsidian is 0.92 kJ/Kg K and that of Schist is 0.70 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Obsidian is heat resistant, impact resistant whereas Schist is impact resistant, pressure resistant, water resistant.

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