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Felsite and Obsidian


Obsidian and Felsite


Definition

Definition
Felsite is a very fine grained volcanic rock that may or may not contain larger crystals and light colored rock that typically requires petrographic examination or chemical analysis for more precise 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   

History
  
  

Origin
Unknown   
Ethiopia   

Discoverer
Unknown   
Obsius   

Etymology
From English feldspar and -ite   
From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius   

Class
Igneous Rocks   
Igneous Rocks   

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

Family
  
  

Group
Volcanic   
Volcanic   

Other Categories
Fine Grained Rock, Opaque Rock   
Opaque Rock   

Texture

Texture
Arborescent Patterned, Vitreous   
Glassy   

Color
Black, Blue, Brown, Green, Orange, Red, Tan, Yellow   
Black, Blue, Brown, Green, Orange, Red, Tan, Yellow   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
No   
No   

Wind Resistant
Yes   
No   

Acid Resistant
No   
No   

Appearance
Layered, Banded, Veined and Shiny   
Shiny   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Flooring, Interior Decoration   
Decorative Aggregates, Interior Decoration   

Exterior Uses
Paving Stone, Garden Decoration   
Garden Decoration   

Other Architectural Uses
Curbing   
Not Yet Used   

Industry
  
  

Construction Industry
Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points   
Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points   

Medical Industry
Surgery   
Surgery   

Antiquity Uses
Artifacts   
Artifacts, Jewellery   

Other Uses
  
  

Commercial Uses
Mirror, Jewelry   
Creating Artwork, Mirror, Used in aquariums   

Types

Types
Not Available   
Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian   

Features
Available in Lots of Colors and Patterns, Clasts are smooth to touch, Splintery, Very fine grained rock   
Blocks negativity, Helps to protect against depression   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Not Yet Used   

Famous Monuments
Not Applicable   
Not Applicable   

Sculpture
Not Yet Used   
Not Yet Used   

Famous Sculptures
Not Applicable   
Not Applicable   

Pictographs
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Not Yet Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
Felsite 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.   
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.   

Composition
  
  

Mineral Content
Feldspar, Iron Oxides   
Not Available   

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

Transformation
  
  

Metamorphism
Yes   
Yes   

Types of Metamorphism
Burial Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional 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, Glacier Erosion, Water Erosion   
Chemical Erosion, Coastal Erosion, Glacier Erosion   

Properties

Physical Properties
  
  

Hardness
5-5.5   
5-5.5   

Grain Size
Fine Grained   
Not Applicable   

Fracture
Conchoidal   
Conchoidal   

Streak
White   
White   

Porosity
Very Less Porous   
Very Less Porous   

Luster
Vitreous   
Vitreous   

Compressive Strength
0.15 N/mm2   
33
0.15 N/mm2   
33

Cleavage
Non-Existent   
Non-Existent   

Toughness
Not Available   
Not Available   

Specific Gravity
2.6-2.7   
2.6-2.7   

Transparency
Translucent   
Translucent   

Density
2.6 g/cm3   
2.6 g/cm3   

Thermal Properties
  
  

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

Resistance
Heat Resistant, Impact Resistant   
Heat Resistant, Impact Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
Afghanistan, Indonesia, Japan, Russia   
Afghanistan, Indonesia, Japan, Russia   

Africa
Kenya   
Kenya   

Europe
Greece, Hungary, Iceland, Italy, Turkey   
Greece, Hungary, Iceland, Italy, Turkey   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, Mexico, USA   
Canada, Mexico, USA   

South America
Argentina, Chile, Ecuador, Peru   
Argentina, Chile, Ecuador, Peru   

Deposits in Oceania Continent
  
  

Australia
New Zealand   
New Zealand   

Summary >>
<< Reserves

All about Felsite and Obsidian Properties

Know all about Felsite and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Felsite and Obsidian belong to Igneous Rocks.Texture of Felsite is Arborescent Patterned, Vitreous whereas that of Obsidian is Glassy. Felsite appears Layered, Banded, Veined and Shiny and Obsidian appears Shiny. The luster of Felsite and Obsidian is vitreous. Felsite and Obsidian are available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Felsite are mirror, jewelry and that of Obsidian are creating artwork, mirror, used in aquariums.

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