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Eclogite and Tachylite


Tachylite and Eclogite


Definition

Definition
Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature   
Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt   

History
  
  

Origin
Unknown   
Iceland   

Discoverer
René Just Haüy   
Unknown   

Etymology
From French, Greek eklogē selection with reference to the selective content of the rock + -ite1   
From German Tachylite, from tachy- + Greek lutos soluble, melting   

Class
Metamorphic Rocks   
Igneous Rocks   

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

Family
  
  

Group
Not Applicable   
Volcanic   

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

Texture

Texture
Earthy   
Vitreous   

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

Maintenance
Less   
More   

Durability
Durable   
Durable   

Water Resistant
No   
Yes   

Scratch Resistant
Yes   
No   

Stain Resistant
Yes   
No   

Wind Resistant
Yes   
Yes   

Acid Resistant
No   
Yes   

Appearance
Dull, Banded and Foilated   
Glassy   

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   
Cutting Tool, Knives, Landscaping, Scrapers   

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

Antiquity Uses
Artifacts   
Artifacts   

Other Uses
  
  

Commercial Uses
Creating Artwork, Gemstone   
Cemetery Markers, Creating Artwork   

Types

Types
Not Available   
Not Available   

Features
Available in Lots of Colors and Patterns, Generally rough to touch, Is one of the oldest rock   
Available in Lots of Colors and Patterns, Clasts are smooth to touch, NA   

Archaeological Significance
  
  

Monuments
Not Yet Used   
Not Yet Used   

Famous Monuments
Not Applicable   
Not Applicable   

Sculpture
Not Yet Used   
Not Yet Used   

Famous Sculptures
Not Applicable   
Not Applicable   

Pictographs
Used   
Used   

Petroglyphs
Used   
Used   

Figurines
Not Yet Used   
Not Yet 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.   
Tachylite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.   

Composition
  
  

Mineral Content
Amphibole, Coesite, Corundum, Dolomite, Garnet, Kyanite, Lawsonite, Paragonite, Phengite, Pyroxene, Quartz, Rutile, Zoisite   
Feldspar, Olivine   

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

Transformation
  
  

Metamorphism
No   
Yes   

Types of Metamorphism
Not Applicable   
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional 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   
Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion   

Properties

Physical Properties
  
  

Hardness
3.5-4   
5.5   

Grain Size
Fine Grained   
Medium to Fine Coarse Grained   

Fracture
Not Available   
Conchoidal   

Streak
White   
Vermilion   

Porosity
Less Porous   
Less Porous   

Luster
Subvitreous to Dull   
Resinous   

Compressive Strength
Not Available   
206.00 N/mm2   
8

Cleavage
Perfect   
Not Available   

Toughness
Not Available   
Not Available   

Specific Gravity
2.86-2.87   
2.4   

Transparency
Opaque   
Opaque   

Density
3.2-3.6 g/cm3   
3.058 g/cm3   

Thermal Properties
  
  

Specific Heat Capacity
Not Available   
0.56 kJ/Kg K   
22

Resistance
Heat Resistant   
Heat Resistant, Impact Resistant, Wear Resistant   

Reserves

Deposits in Eastern Continents
  
  

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

Africa
Ethiopia, Morocco, South Africa   
East Africa   

Europe
France, Germany, Italy, Norway, Scotland   
England, Germany, Hungary, Iceland, Scotland, Sweden   

Others
Greenland   
Hawaii Islands   

Deposits in Western Continents
  
  

North America
Canada, Costa Rica, Panama, USA   
USA   

South America
Argentina, Brazil, Colombia, Ecuador   
Not Yet Found   

Deposits in Oceania Continent
  
  

Australia
Central Australia, New Zealand, Queensland   
Victoria   

Summary >>
<< Reserves

All about Eclogite and Tachylite Properties

Know all about Eclogite and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Eclogite belongs to Metamorphic Rocks while Tachylite belongs to Igneous Rocks.Texture of Eclogite is Earthy whereas that of Tachylite is Vitreous. Eclogite appears Dull, Banded and Foilated and Tachylite appears Glassy. The luster of Eclogite is subvitreous to dull while that of Tachylite is resinous. Eclogite is available in black, brown, colourless, green, grey, pink, white colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Eclogite are creating artwork, gemstone and that of Tachylite are cemetery markers, creating artwork.

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