Kimberlite

Mylonite

Kimberlite and Mylonite

Kimberlite

Mylonite

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Definition

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

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

History

Origin

Kimberley, South Africa

New Zealand

Discoverer

John W. Judd

Unknown

Etymology

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

From Greek mulōn mill + -ite

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

Coarse Grained Rock, Fine Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Porphyritic

Foliated

Color

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

Black to Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Banded

Dull, Banded and Foilated

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Homes, Interior Decoration

Decorative Aggregates, Interior Decoration

Exterior Uses

As Building Stone, Paving Stone, Garden Decoration

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

Other Architectural Uses

Curbing

Industry

Construction Industry

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

for Road Aggregate, Landscaping, Roadstone

Medical Industry

Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts, Monuments

Other Uses

Commercial Uses

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

Creating Artwork, Gemstone, Jewelry

Types

Basaltic Kimberlites and Micaceous Kimberlites

Blastomylonites, Ultramylonites and Phyllonites

Features

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

Surfaces are often shiny

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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.

Mylonites are ductilely deformed rocks formed by the accumulation of large shear strain, in ductile fault zones.

Composition

Mineral Content

Garnet, Olivine, Phlogopite, Pyroxene

Porphyroblasts

Compound Content

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

Aluminium Oxide, Calcium Sulfate, Chromium(III) Oxide, Iron(III) Oxide, Magnesium Carbonate, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of 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

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

Chemical Erosion, Sea Erosion, Wind Erosion

Properties

Physical Properties

Hardness

6-73-4

1 7

👆🏻

Grain Size

Fine to Coarse Grained

Fine Grained

Fracture

Conchoidal

Streak

White

Porosity

Very Less Porous

Highly Porous

Luster

Subvitreous to Dull

Shiny

Compressive Strength

260.00 N/mm²1.28 N/mm²

0.15 450

👆🏻

Cleavage

Conchoidal

Toughness

Specific Gravity

2.86-2.872.97-3.05

0 8.4

👆🏻

Transparency

Translucent to Opaque

Opaque

Density

2.95-2.96 g/cm³2.6-4.8 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K1.50 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant

Heat Resistant, Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

Russia

China, India, Indonesia, Saudi Arabia, South Korea

Africa

Angola, Botswana, Cameroon, Ethiopia, South Africa

Eritrea, Ethiopia, Ghana, South Africa, Western Africa

Europe

England, Hungary, Iceland, United Kingdom

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

Others

Antarctica

Deposits in Western Continents

North America

Canada, USA

USA

South America

Argentina, Colombia, Ecuador

Deposits in Oceania Continent

Australia

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

Central Australia, Western Australia

All about Kimberlite and Mylonite Properties

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