Rapakivi Granite

Kimberlite

Rapakivi Granite and Kimberlite

Kimberlite

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Definition

Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase

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

Finland, Europe

Kimberley, South Africa

Discoverer

Jakob Sederholm

John W. Judd

Etymology

From Finnish Rapakivi which stands for crumbly rock

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

Plutonic

Volcanic

Other Categories

Coarse Grained Rock, Opaque Rock

Coarse Grained Rock, Fine Grained Rock, Opaque Rock

Texture

Granular, Phaneritic

Porphyritic

Color

Black, Grey, Orange, Pink, White

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

Maintenance

Less

Durability

Durable

Water Resistant

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Scratch Resistant

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Stain Resistant

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Wind Resistant

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Acid Resistant

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Appearance

Veined or Pebbled

Dull and Banded

Uses

Architecture

Interior Uses

Bathrooms, Countertops, Decorative Aggregates, Entryways, Floor Tiles, Flooring, Homes, Hotels, Interior Decoration, Kitchens, Stair Treads

Countertops, Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Office Buildings, Paving Stone, Resorts

As Building Stone, Paving Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone

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, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Cemetery Markers, Commemorative Tablets, Creating Artwork, Curling, Laboratory bench tops, Tombstones

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

Types

Igneous Protolith Granite, Sedimentary Protolith Granite, Mantle Granite, Anorogenic Granite and Hybrid Granite

Basaltic Kimberlites and Micaceous Kimberlites

Features

Available in Lots of Colors and Patterns, 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

Granite is an igneous rock which is very hard, crystalline and is visibly homogeneous in texture and forms by melting of continental 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

Amphibole, Biotite, Feldspar, Hornblade, Micas, Muscovite or Illite, Plagioclase, Pyroxene, Quartz

Garnet, Olivine, Phlogopite, Pyroxene

Compound Content

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

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

Transformation

Metamorphism

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Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact 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, Water Erosion, Wind 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

Large and Coarse Grained

Fine to Coarse Grained

Fracture

Conchoidal

Streak

White

Porosity

Less Porous

Very Less Porous

Luster

Dull to Grainy with Sporadic parts Pearly and Vitreous

Subvitreous to Dull

Compressive Strength

175.00 N/mm²260.00 N/mm²

0.15 450

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Cleavage

Conchoidal

Toughness

Specific Gravity

2.6-2.72.86-2.87

0 8.4

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Transparency

Opaque

Translucent to Opaque

Density

2.6-2.8 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

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Resistance

Heat Resistant, Wear Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam

Russia

Africa

Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa

Angola, Botswana, Cameroon, Ethiopia, South Africa

Europe

Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland, The Czech Republic

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

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

All about Rapakivi Granite and Kimberlite Properties

Know all about Rapakivi Granite and Kimberlite properties here. All properties of rocks are important as they define the type of rock and its application. Rapakivi Granite and Kimberlite belong to Igneous Rocks.Texture of Rapakivi Granite is Granular, Phaneritic whereas that of Kimberlite is Porphyritic. Rapakivi Granite appears Veined or Pebbled and Kimberlite appears Dull and Banded. The luster of Rapakivi Granite is dull to grainy with sporadic parts pearly and vitreous while that of Kimberlite is subvitreous to dull. Rapakivi Granite is available in black, grey, orange, pink, white colors whereas Kimberlite is available in black, bluish - grey, brown, dark greenish - grey, green, grey colors. The commercial uses of Rapakivi Granite are cemetery markers, commemorative tablets, creating artwork, curling, laboratory bench tops, tombstones 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).