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Mylonite vs Obsidian


Obsidian vs Mylonite


Definition

Definition
Mylonite is a metamorphic rock formed by ductile deformation during intense shearing encountered during folding and faulting, a process termed cataclastic or dynamic metamorphism   
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
New Zealand   
Ethiopia   

Discoverer
Unknown   
Obsius   

Etymology
From Greek mulōn mill + -ite   
From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius   

Class
Metamorphic Rocks   
Igneous Rocks   

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

Family
  
  

Group
Not Applicable   
Volcanic   

Other Categories
Fine Grained Rock, Opaque Rock   
Opaque Rock   

Texture

Texture
Foliated   
Glassy   

Color
Black to Grey   
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
No   
No   

Acid Resistant
No   
No   

Appearance
Dull, Banded and Foilated   
Shiny   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Not Yet Used   

Industry
  
  

Construction Industry
for Road Aggregate, Landscaping, Roadstone   
Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points   

Medical Industry
Not Yet Used   
Surgery   

Antiquity Uses
Artifacts, Monuments   
Artifacts, Jewellery   

Other Uses
  
  

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

Types

Types
Blastomylonites, Ultramylonites and Phyllonites   
Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian   

Features
Surfaces are often shiny   
Blocks negativity, Helps to protect against depression   

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
Mylonites are ductilely deformed rocks formed by the accumulation of large shear strain, in ductile fault zones.   
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
Porphyroblasts   
Not Available   

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

Transformation
  
  

Metamorphism
No   
Yes   

Types of Metamorphism
Not Applicable   
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, Sea Erosion, Wind Erosion   
Chemical Erosion, Coastal Erosion, Glacier Erosion   

Properties

Physical Properties
  
  

Hardness
3-4   
5-5.5   

Grain Size
Fine Grained   
Not Applicable   

Fracture
Conchoidal   
Conchoidal   

Streak
White   
White   

Porosity
Highly Porous   
Very Less Porous   

Luster
Shiny   
Vitreous   

Compressive Strength
1.28 N/mm2   
32
0.15 N/mm2   
33

Cleavage
Conchoidal   
Non-Existent   

Toughness
Not Available   
Not Available   

Specific Gravity
2.97-3.05   
2.6-2.7   

Transparency
Opaque   
Translucent   

Density
2.6-4.8 g/cm3   
2.6 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
1.50 kJ/Kg K   
3
0.92 kJ/Kg K   
10

Resistance
Heat Resistant, Impact Resistant, Pressure Resistant   
Heat Resistant, Impact Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India, Indonesia, Saudi Arabia, South Korea   
Afghanistan, Indonesia, Japan, Russia   

Africa
Eritrea, Ethiopia, Ghana, South Africa, Western Africa   
Kenya   

Europe
England, Finland, France, Germany, Great Britain, Greece, United Kingdom   
Greece, Hungary, Iceland, Italy, Turkey   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
USA   
Canada, Mexico, USA   

South America
Not Yet Found   
Argentina, Chile, Ecuador, Peru   

Deposits in Oceania Continent
  
  

Australia
Central Australia, Western Australia   
New Zealand   

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Mylonite vs Obsidian 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 Mylonite and Obsidian Reserves. Mylonite is a metamorphic rock formed by ductile deformation during intense shearing encountered during folding and faulting, a process termed cataclastic or dynamic metamorphism. 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. 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 Mylonite vs Obsidian information and Mylonite vs Obsidian characteristics in the upcoming sections.

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

More about Mylonite and Obsidian

Here you can know more about Mylonite and Obsidian. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Mylonite and Obsidian consists of mineral content and compound content. The mineral content of Mylonite includes Porphyroblasts and mineral content of Obsidian is not available. You can also check out the list of all Metamorphic Rocks. When we have to compare Mylonite vs Obsidian, the texture, color and appearance plays an important role in determining the type of rock. Mylonite is available in black to grey colors whereas, Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. Appearance of Mylonite is Dull, Banded and Foilated and that of Obsidian is Shiny. Properties of rock is another aspect for Mylonite vs Obsidian. The hardness of Mylonite is 3-4 and that of Obsidian is 5-5.5. The types of Mylonite are Blastomylonites, Ultramylonites and Phyllonites whereas types of Obsidian are Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Mylonite and Obsidian is white. The specific heat capacity of Mylonite is 1.50 kJ/Kg K and that of Obsidian is 0.92 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Mylonite is heat resistant, impact resistant, pressure resistant whereas Obsidian is heat resistant, impact resistant.

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