Rapakivi Granite

Eclogite

Rapakivi Granite and Eclogite

Eclogite

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Definition

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

Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature

History

Origin

Finland, Europe

Discoverer

Jakob Sederholm

René Just Haüy

Etymology

From Finnish Rapakivi which stands for crumbly rock

From French, Greek eklogē selection with reference to the selective content of the rock + -ite1

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Plutonic

Other Categories

Coarse Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Granular, Phaneritic

Earthy

Color

Black, Grey, Orange, Pink, White

Black, Brown, Green, Grey, Pink, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Veined or Pebbled

Dull, Banded and Foilated

Uses

Architecture

Interior Uses

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

Decorative Aggregates, Interior Decoration

Exterior Uses

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

Paving Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone

Medical Industry

In Chemical and Pharmaceutical Industry, Medicines and Cosmetics

Antiquity Uses

Artifacts, Monuments, Sculpture, Small Figurines

Artifacts

Other Uses

Commercial Uses

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

Creating Artwork, Gemstone

Types

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

Eclogite

Features

Available in Lots of Colors and Patterns, It is One of the Oldest, Strongest and Hardest Rock

Available in Lots of Colors and Patterns, Generally rough to touch, Is one of the oldest rock

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

Eclogite forms from high-pressure metamorphism of mafic igneous rocks mainly, basalt or gabbro as it plunges into the mantle in a subduction zone.

Composition

Mineral Content

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

Amphibole, Coesite, Corundum, Dolomite, Garnet, Kyanite, Lawsonite, Paragonite, Phengite, Pyroxene, Quartz, Rutile, Zoisite

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, Carbon Dioxide, Iron(III) Oxide, Magnesium Carbonate, MgO, Sodium Oxide, Potassium, Sodium

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Sea Erosion

Properties

Physical Properties

Hardness

6-73.5-4

1 7

👆🏻

Grain Size

Large and Coarse Grained

Fine Grained

Fracture

Streak

White

Porosity

Less Porous

Luster

Dull to Grainy with Sporadic parts Pearly and Vitreous

Subvitreous to Dull

Compressive Strength

175.00 N/mm²200.00 N/mm²

0.15 450

👆🏻

Cleavage

Perfect

Toughness

Specific Gravity

2.6-2.72.86-2.87

0 8.4

👆🏻

Transparency

Opaque

Density

2.6-2.8 g/cm³3.2-3.6 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.79 kJ/Kg K0.75 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Wear Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

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

India, Kazakhstan, Kuwait, Russia, South Korea, Thailand, Turkey

Africa

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

Ethiopia, Morocco, South Africa

Europe

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

France, Germany, Italy, Norway, Scotland

Others

Greenland

Deposits in Western Continents

North America

Canada, USA

Canada, Costa Rica, Panama, USA

South America

Argentina, Brazil, Colombia, Ecuador

Deposits in Oceania Continent

Australia

Central Australia, New Zealand, Queensland

All about Rapakivi Granite and Eclogite Properties

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