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Picrite and Comendite


Comendite and Picrite


Definition

Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine   
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite   

History
  
  

Origin
Hawaii Islands   
Italy   

Discoverer
Unknown   
Unknown   

Etymology
From Greek pikros bitter + -ite, 19th century   
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy   

Class
Igneous Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Hard Rock   

Family
  
  

Group
Volcanic   
Volcanic   

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

Texture

Texture
Earthy, Rough   
Porphyritic   

Color
Black, Brown, Colourless, Green, Grey, Pink, White, Yellow   
Blue, Bluish - Grey   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
Yes   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
Yes   

Wind Resistant
Yes   
Yes   

Acid Resistant
Yes   
Yes   

Appearance
Rough and Shiny   
Foliated   

Uses

Architecture
  
  

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

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
As a Sintering Agent in Steel Industry to process Iron Ore, Cement Manufacture, for Road Aggregate, Manufacture of Magnesium and Dolomite Refractories, Roadstone, Used for flooring, stair treads, borders and window sills.   
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, Sculpture   
Artifacts   

Other Uses
  
  

Commercial Uses
As a Feed Additive for Livestock, As armour rock for sea walls, Metallurgical Flux, Pottery, Source of Magnesia (MgO)   
Cemetery Markers   

Types

Types
Oceanite   
Rhyolite   

Features
Host Rock for Lead   
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
Not Used   
Not Used   

Petroglyphs
Not Used   
Not Used   

Figurines
Used   
Not Yet Used   

Fossils
Absent   
Absent   

Formation

Formation
Picrite 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.   
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
Biotite, Olivine, Plagioclase, Pyrrhotite   
Albite, Amphibole, Quartz   

Compound Content
Al, CaO, Carbon Dioxide, Mg, MgO   
Al, Fe, Potassium Oxide   

Transformation
  
  

Metamorphism
Yes   
Yes   

Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Impact Metamorphism, Regional Metamorphism   
Cataclastic Metamorphism, Regional Metamorphism   

Weathering
Yes   
Yes   

Types of Weathering
Biological Weathering   
Biological Weathering, Chemical Weathering, Mechanical Weathering   

Erosion
Yes   
Yes   

Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion   
Coastal Erosion, Water Erosion   

Properties

Physical Properties
  
  

Hardness
6.8   
6-7   

Grain Size
Fine Grained   
Medium Grained   

Fracture
Uneven   
Pervasive   

Streak
White, Greenish White or Grey   
Bluish Black   

Porosity
Less Porous   
Highly Porous   

Luster
Subvitreous to Dull   
Dull   

Compressive Strength
189.00 N/mm2   
11
92.40 N/mm2   
21

Cleavage
Imperfect   
Not Available   

Toughness
2.1   
2   

Specific Gravity
2.75-2.92   
2.38   

Transparency
Opaque   
Opaque   

Density
1.5-2.5 g/cm3   
Not Available   

Thermal Properties
  
  

Specific Heat Capacity
0.88 kJ/Kg K   
13
Not Available   

Resistance
Heat Resistant   
Heat Resistant, Impact Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Russia   
China   

Africa
South Africa   
East Africa   

Europe
Iceland   
Italy   

Others
Not Yet Found   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, USA   
Not Yet Found   

South America
Brazil   
Not Yet Found   

Deposits in Oceania Continent
  
  

Australia
Not Yet Found   
Queensland   

Summary >>
<< Reserves

All about Picrite and Comendite Properties

Know all about Picrite and Comendite properties here. All properties of rocks are important as they define the type of rock and its application. Picrite and Comendite belong to Igneous Rocks.Texture of Picrite is Earthy, Rough whereas that of Comendite is Porphyritic. Picrite appears Rough and Shiny and Comendite appears Foliated. The luster of Picrite is subvitreous to dull while that of Comendite is dull. Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors whereas Comendite is available in blue, bluish - grey colors. The commercial uses of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo) and that of Comendite are cemetery markers.

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