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Eclogite and Dunite


Dunite and Eclogite


Definition

Definition
Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature   
Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine   

History
  
  

Origin
Unknown   
New Zealand   

Discoverer
René Just Haüy   
Ferdinand von Hochstetter   

Etymology
From French, Greek eklogē selection with reference to the selective content of the rock + -ite1   
From the name of Dun Mountain, New Zealand, + -ite1   

Class
Metamorphic Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Medium Hardness Rock   
Durable Rock, Medium Hardness Rock   

Family
  
  

Group
Not Applicable   
Plutonic   

Other Categories
Fine Grained Rock, Opaque Rock   
Coarse Grained Rock, Opaque Rock   

Texture

Texture
Earthy   
Phaneritic   

Color
Black, Brown, Colourless, Green, Grey, Pink, White   
Dark Greenish - Grey   

Maintenance
Less   
Less   

Durability
Durable   
Durable   

Water Resistant
No   
Yes   

Scratch Resistant
Yes   
Yes   

Stain Resistant
Yes   
Yes   

Wind Resistant
Yes   
No   

Acid Resistant
No   
No   

Appearance
Dull, Banded and Foilated   
Rough and Shiny   

Uses

Architecture
  
  

Interior Uses
Decorative Aggregates, Interior Decoration   
Decorative Aggregates, Interior Decoration   

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

Other Architectural Uses
Curbing   
Curbing   

Industry
  
  

Construction Industry
Not Yet Used   
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar   

Medical Industry
In Chemical and Pharmaceutical Industry, Medicines and Cosmetics   
Not Yet Used   

Antiquity Uses
Artifacts   
Artifacts, Monuments, Sculpture, Small Figurines   

Other Uses
  
  

Commercial Uses
Creating Artwork, Gemstone   
Creating Artwork, Gemstone, Jewelry, Source of Chromite, Platinum, Nickel and Garnet, Source of Diamonds   

Types

Types
Not Available   
Not Available   

Features
Available in Lots of Colors and Patterns, Generally rough to touch, Is one of the oldest rock   
Constitutes upper part of the Earth's mantle, Generally rough to touch, Host rock for Diamond, Is one of the oldest rock   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Used   

Famous Monuments
Not Applicable   
Data Not Available   

Sculpture
Not Yet Used   
Used   

Famous Sculptures
Not Applicable   
Data Not Available   

Pictographs
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Not Yet Used   
Used   

Fossils
Absent   
Absent   

Formation

Formation
Eclogite forms from high-pressure metamorphism of mafic igneous rocks mainly, basalt or gabbro as it plunges into the mantle in a subduction zone.   
Dunite is a plutonic ultramafic igneous rock consisting almost m olivine. It can be formed in two ways.   

Composition
  
  

Mineral Content
Amphibole, Coesite, Corundum, Dolomite, Garnet, Kyanite, Lawsonite, Paragonite, Phengite, Pyroxene, Quartz, Rutile, Zoisite   
Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene   

Compound Content
Aluminium Oxide, NaCl, CaO, Carbon Dioxide, Iron(III) Oxide, Magnesium Carbonate, MgO, Sodium Oxide, Potassium, Sodium   
Ca, CaO, Fe, Potassium, Silicon Dioxide, Sodium, Titanium Dioxide   

Transformation
  
  

Metamorphism
No   
Yes   

Types of Metamorphism
Not Applicable   
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism   

Weathering
Yes   
Yes   

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

Erosion
Yes   
Yes   

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

Properties

Physical Properties
  
  

Hardness
3.5-4   
3.5-4   

Grain Size
Fine Grained   
Coarse Grained   

Fracture
Not Available   
Irregular   

Streak
White   
White   

Porosity
Less Porous   
Less Porous   

Luster
Subvitreous to Dull   
Shiny   

Compressive Strength
Not Available   
107.55 N/mm2   
19

Cleavage
Perfect   
Imperfect   

Toughness
Not Available   
2.1   

Specific Gravity
2.86-2.87   
3-3.01   

Transparency
Opaque   
Translucent to Opaque   

Density
3.2-3.6 g/cm3   
2.84-2.85 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
1.25 kJ/Kg K   
6

Resistance
Heat Resistant   
Heat Resistant, Pressure Resistant, Wear Resistant   

Reserves

Deposits in Eastern Continents
  
  

Asia
India, Kazakhstan, Kuwait, Russia, South Korea, Thailand, Turkey   
China, India, Indonesia, Kazakhstan, Russia, South Korea, Thailand, Turkey   

Africa
Ethiopia, Morocco, South Africa   
Morocco, South Africa   

Europe
France, Germany, Italy, Norway, Scotland   
Finland, France, Georgia, Germany, Great Britain, Italy, Kazakhstan, Netherlands, Norway, Spain, Switzerland, Venezuela   

Others
Greenland   
Not Yet Found   

Deposits in Western Continents
  
  

North America
Canada, Costa Rica, Panama, USA   
Canada, USA   

South America
Argentina, Brazil, Colombia, Ecuador   
Argentina, Brazil, Colombia, Ecuador, Venezuela   

Deposits in Oceania Continent
  
  

Australia
Central Australia, New Zealand, Queensland   
New Zealand, Western Australia   

Summary >>
<< Reserves

All about Eclogite and Dunite Properties

Know all about Eclogite and Dunite properties here. All properties of rocks are important as they define the type of rock and its application. Eclogite belongs to Metamorphic Rocks while Dunite belongs to Igneous Rocks.Texture of Eclogite is Earthy whereas that of Dunite is Phaneritic. Eclogite appears Dull, Banded and Foilated and Dunite appears Rough and Shiny. The luster of Eclogite is subvitreous to dull while that of Dunite is shiny. Eclogite is available in black, brown, colourless, green, grey, pink, white colors whereas Dunite is available in dark greenish - grey colors. The commercial uses of Eclogite are creating artwork, gemstone and that of Dunite are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds.

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