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Mylonite and Comendite


Comendite and 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   
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite   

History
  
  

Origin
New Zealand   
Italy   

Discoverer
Unknown   
Unknown   

Etymology
From Greek mulōn mill + -ite   
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy   

Class
Metamorphic Rocks   
Igneous Rocks   

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

Family
  
  

Group
Not Applicable   
Volcanic   

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

Texture

Texture
Foliated   
Porphyritic   

Color
Black to Grey   
Blue, Bluish - Grey   

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   
Yes   

Appearance
Dull, Banded and Foilated   
Foliated   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
for Road Aggregate, Landscaping, Roadstone   
Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Raw material for the manufacture of mortar   

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts, Monuments   
Artifacts   

Other Uses
  
  

Commercial Uses
Creating Artwork, Gemstone, Jewelry   
Cemetery Markers   

Types

Types
Blastomylonites, Ultramylonites and Phyllonites   
Rhyolite   

Features
Surfaces are often shiny   
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock   

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   
Not Used   

Petroglyphs
Used   
Not 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.   
Comendite is a type of Igneous rock which is formed due to cooling and solidification of lava or magma. It may form with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.   

Composition
  
  

Mineral Content
Porphyroblasts   
Albite, Amphibole, Quartz   

Compound Content
Aluminium Oxide, Calcium Sulfate, Chromium(III) Oxide, Iron(III) Oxide, Magnesium Carbonate, Silicon Dioxide   
Al, Fe, Potassium Oxide   

Transformation
  
  

Metamorphism
No   
Yes   

Types of Metamorphism
Not Applicable   
Cataclastic Metamorphism, Regional 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   
Coastal Erosion, Water Erosion   

Properties

Physical Properties
  
  

Hardness
3-4   
6-7   

Grain Size
Fine Grained   
Medium Grained   

Fracture
Conchoidal   
Pervasive   

Streak
White   
Bluish Black   

Porosity
Highly Porous   
Highly Porous   

Luster
Shiny   
Dull   

Compressive Strength
1.28 N/mm2   
32
92.40 N/mm2   
21

Cleavage
Conchoidal   
Not Available   

Toughness
Not Available   
2   

Specific Gravity
2.97-3.05   
2.38   

Transparency
Opaque   
Opaque   

Density
2.6-4.8 g/cm3   
Not Available   

Thermal Properties
  
  

Specific Heat Capacity
1.50 kJ/Kg K   
3
Not Available   

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

Reserves

Deposits in Eastern Continents
  
  

Asia
China, India, Indonesia, Saudi Arabia, South Korea   
China   

Africa
Eritrea, Ethiopia, Ghana, South Africa, Western Africa   
East Africa   

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

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
USA   
Not Yet Found   

South America
Not Yet Found   
Not Yet Found   

Deposits in Oceania Continent
  
  

Australia
Central Australia, Western Australia   
Queensland   

Summary >>
<< Reserves

All about Mylonite and Comendite Properties

Know all about Mylonite and Comendite properties here. All properties of rocks are important as they define the type of rock and its application. Mylonite belongs to Metamorphic Rocks while Comendite belongs to Igneous Rocks.Texture of Mylonite is Foliated whereas that of Comendite is Porphyritic. Mylonite appears Dull, Banded and Foilated and Comendite appears Foliated. The luster of Mylonite is shiny while that of Comendite is dull. Mylonite is available in black to grey colors whereas Comendite is available in blue, bluish - grey colors. The commercial uses of Mylonite are creating artwork, gemstone, jewelry and that of Comendite are cemetery markers.

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