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Comendite and Metapelite


Metapelite and Comendite


Definition

Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite   
Metapelite is an old and currently not widely used field geological term for a clay rich fine-grained clastic sediment or sedimentary rock, i.e. mud or a mudstone   

History
  
  

Origin
Italy   
Unknown   

Discoverer
Unknown   
Unknown   

Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy   
From Pelos or clay in Greek   

Class
Igneous Rocks   
Metamorphic Rocks   

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

Family
  
  

Group
Volcanic   
Not Applicable   

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

Texture

Texture
Porphyritic   
Foliated   

Color
Blue, Bluish - Grey   
Dark Greenish - Grey, Green, Light Green, Light Greenish Grey   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
Yes   

Wind Resistant
Yes   
No   

Acid Resistant
Yes   
No   

Appearance
Foliated   
Banded   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

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

Medical Industry
Not Yet Used   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts   

Other Uses
  
  

Commercial Uses
Cemetery Markers   
Commemorative Tablets, Creating Artwork   

Types

Types
Rhyolite   
Not Available   

Features
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock   
Easily splits into thin plates, It is One of the Oldest, Strongest and Hardest Rock   

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
Not Used   
Used   

Petroglyphs
Not Used   
Used   

Figurines
Not Yet Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
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.   
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Metapelite is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.   

Composition
  
  

Mineral Content
Albite, Amphibole, Quartz   
Albite, Chlorite, Quartz   

Compound Content
Al, Fe, Potassium Oxide   
Aluminium Oxide, CaO, MgO   

Transformation
  
  

Metamorphism
Yes   
No   

Types of Metamorphism
Cataclastic Metamorphism, Regional 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
Coastal Erosion, Water Erosion   
Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion   

Properties

Physical Properties
  
  

Hardness
6-7   
5-6   

Grain Size
Medium Grained   
Medium to Fine Coarse Grained   

Fracture
Pervasive   
Fibrous   

Streak
Bluish Black   
Unknown   

Porosity
Highly Porous   
Highly Porous   

Luster
Dull   
Earthy   

Compressive Strength
92.40 N/mm2   
21
Not Available   

Cleavage
Not Available   
Not Available   

Toughness
2   
Not Available   

Specific Gravity
2.38   
3.4-3.7   

Transparency
Opaque   
Opaque   

Density
Not Available   
0-300 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
0.72 kJ/Kg K   
20

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

Reserves

Deposits in Eastern Continents
  
  

Asia
China   
Not Yet Found   

Africa
East Africa   
Western Africa   

Europe
Italy   
United Kingdom   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Not Yet Found   
Not Available   

South America
Not Yet Found   
Brazil, Colombia, Ecuador   

Deposits in Oceania Continent
  
  

Australia
Queensland   
Central Australia, Western Australia   

Summary >>
<< Reserves

All about Comendite and Metapelite Properties

Know all about Comendite and Metapelite properties here. All properties of rocks are important as they define the type of rock and its application. Comendite belongs to Igneous Rocks while Metapelite belongs to Metamorphic Rocks.Texture of Comendite is Porphyritic whereas that of Metapelite is Foliated. Comendite appears Foliated and Metapelite appears Banded. The luster of Comendite is dull while that of Metapelite is earthy. Comendite is available in blue, bluish - grey colors whereas Metapelite is available in dark greenish - grey, green, light green, light greenish grey colors. The commercial uses of Comendite are cemetery markers and that of Metapelite are commemorative tablets, creating artwork.

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