Comendite

Kimberlite

Comendite and Kimberlite

Comendite

Kimberlite

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Definition

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

Kimberlite is a rare, blue-tinged, coarse-grained intrusive igneous rock, which sometimes contains diamonds and is mostly found in South Africa and Siberia.

History

Origin

Italy

Kimberley, South Africa

Discoverer

Unknown

John W. Judd

Etymology

Comendite derives its name from the area of Le Commende on San Pietro Island in Italy

From Kimberley +‎ -ite, from the name of the South African town of Kimberley where the rock was first found.

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Medium Grained Rock, Opaque Rock

Coarse Grained Rock, Fine Grained Rock, Opaque Rock

Texture

Porphyritic

Color

Blue, Bluish - Grey

Black, Bluish - Grey, Brown, Dark Greenish - Grey, Green, Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Foliated

Dull and Banded

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Interior Decoration

Countertops, Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration

As Building Stone, Paving Stone, Garden Decoration

Other Architectural Uses

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

As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement, Manufacture of Magnesium and Dolomite Refractories

Medical Industry

Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts

Artifacts, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Cemetery Markers

An Oil and Gas Reservoir, As a Feed Additive for Livestock, Gemstone, Metallurgical Flux, Production of Lime, Soil Conditioner, Source of Magnesia (MgO)

Types

Rhyolite

Basaltic Kimberlites and Micaceous Kimberlites

Features

Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock

Always found as volcanic pipes over deep continental crust, Host rock for Diamond, Is one of the oldest rock, Surfaces are often shiny

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

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.

Kimberlite is an igneous rock and is the main source of diamonds. Its formation takes place deep beneath the Earth’s surface between 150 to 450 kilometres, and are erupted rapidly and violently.

Composition

Mineral Content

Albite, Amphibole, Quartz

Garnet, Olivine, Phlogopite, Pyroxene

Compound Content

Al, Fe, Potassium Oxide

Aluminium Oxide, NaCl, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Water Erosion

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

Properties

Physical Properties

Hardness

6-76-7

1 7

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Grain Size

Medium Grained

Fine to Coarse Grained

Fracture

Pervasive

Conchoidal

Streak

Bluish Black

White

Porosity

Highly Porous

Very Less Porous

Luster

Dull

Subvitreous to Dull

Compressive Strength

92.40 N/mm²260.00 N/mm²

0.15 450

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Cleavage

Conchoidal

Toughness

Specific Gravity

2.382.86-2.87

0 8.4

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Transparency

Opaque

Translucent to Opaque

Density

-9999 g/cm³2.95-2.96 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

0.79 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

China

Russia

Africa

East Africa

Angola, Botswana, Cameroon, Ethiopia, South Africa

Europe

Italy

England, Hungary, Iceland, United Kingdom

Others

Antarctica

Deposits in Western Continents

North America

Canada, USA

South America

Argentina, Colombia, Ecuador

Deposits in Oceania Continent

Australia

Queensland

New South Wales, New Zealand, South Australia, Western Australia

All about Comendite and Kimberlite Properties

Know all about Comendite and Kimberlite properties here. All properties of rocks are important as they define the type of rock and its application. Comendite and Kimberlite belong to Igneous Rocks.Texture of Comendite is Porphyritic whereas that of Kimberlite is Porphyritic. Comendite appears Foliated and Kimberlite appears Dull and Banded. The luster of Comendite is dull while that of Kimberlite is subvitreous to dull. Comendite is available in blue, bluish - grey colors whereas Kimberlite is available in black, bluish - grey, brown, dark greenish - grey, green, grey colors. The commercial uses of Comendite are cemetery markers and that of Kimberlite are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo).