Definition
Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature
  
Argillites are highly compact sedimentary or slightly metamorphosed rocks that consist largely or wholly of particles of clay or silt but lack the fissility of shale or the cleavage characteristic of slate
  
History
  
  
Discoverer
René Just Haüy
  
Unknown
  
Etymology
From French, Greek eklogē selection with reference to the selective content of the rock + -ite1
  
From Latin Argilla (clay) and -ite in English which became agrilla+ -ite = Argillite
  
Class
Metamorphic Rocks
  
Sedimentary Rocks
  
Sub-Class
Durable Rock, Medium Hardness Rock
  
Durable Rock, Soft Rock
  
Family
  
  
Group
Not Applicable
  
Not Applicable
  
Other Categories
Fine Grained Rock, Opaque Rock
  
Fine Grained Rock, Opaque Rock
  
Texture
Earthy
  
Clastic, Polished
  
Color
Black, Brown, Colourless, Green, Grey, Pink, White
  
Dark Grey to Black, Pink, Red, White
  
Maintenance
Less
  
Less
  
Durability
Durable
  
Durable
  
Water Resistant
No
  
No
  
Scratch Resistant
Yes
  
Yes
  
Stain Resistant
Yes
  
Yes
  
Wind Resistant
Yes
  
Yes
  
Acid Resistant
No
  
Yes
  
Appearance
Dull, Banded and Foilated
  
Rough and Dull
  
Architecture
  
  
Interior Uses
Decorative Aggregates, Interior Decoration
  
Decorative Aggregates, Homes, Interior Decoration
  
Exterior Uses
Paving Stone, Garden Decoration
  
As Building Stone, Garden Decoration, Office Buildings
  
Other Architectural Uses
Curbing
  
Curbing, Whetstones
  
Industry
  
  
Construction Industry
Not Yet Used
  
Used for flooring, stair treads, borders and window sills.
  
Medical Industry
In Chemical and Pharmaceutical Industry, Medicines and Cosmetics
  
Not Yet Used
  
Antiquity Uses
Artifacts
  
Artifacts, Monuments, Sculpture
  
Other Uses
  
  
Commercial Uses
Creating Artwork, Gemstone
  
Fire resistant, Used to manufracture paperweights and bookends
  
Types
Not Available
  
Not Available
  
Features
Available in Lots of Colors and Patterns, Generally rough to touch, Is one of the oldest rock
  
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
  
Present
  
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.
  
An argillite is a fine-grained sedimentary rock mainly composed of clay particles which forms from lithified muds which contain variable amounts of silt-sized particles.
  
Composition
  
  
Mineral Content
Amphibole, Coesite, Corundum, Dolomite, Garnet, Kyanite, Lawsonite, Paragonite, Phengite, Pyroxene, Quartz, Rutile, Zoisite
  
Biotite, Chlorite, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyrite, Quartz
  
Compound Content
Aluminium Oxide, NaCl, CaO, Carbon Dioxide, Iron(III) Oxide, Magnesium Carbonate, MgO, Sodium Oxide, Potassium, Sodium
  
Iron(III) Oxide, Potassium Oxide, MgO, Silicon Dioxide
  
Transformation
  
  
Metamorphism
No
  
No
  
Types of Metamorphism
Not Applicable
  
Not Applicable
  
Weathering
Yes
  
Yes
  
Types of Weathering
Mechanical Weathering
  
Biological Weathering
  
Erosion
Yes
  
Yes
  
Types of Erosion
Chemical Erosion, Sea Erosion
  
Chemical Erosion
  
Physical Properties
  
  
Hardness
3.5-4
  
2-3
  
Grain Size
Fine Grained
  
Fine Grained
  
Fracture
Not Available
  
Conchoidal to Uneven
  
Streak
White
  
White to Grey
  
Porosity
Less Porous
  
Highly Porous
  
Luster
Subvitreous to Dull
  
Waxy and Dull
  
Cleavage
Perfect
  
Slaty
  
Toughness
Not Available
  
2.6
  
Specific Gravity
2.86-2.87
  
2.56-2.68
  
Transparency
Opaque
  
Opaque
  
Density
3.2-3.6 g/cm3
  
2.54-2.66 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
Not Available
  
0.87 kJ/Kg K
  
14
Resistance
Heat Resistant
  
Heat Resistant, Impact Resistant
  
Deposits in Eastern Continents
  
  
Asia
India, Kazakhstan, Kuwait, Russia, South Korea, Thailand, Turkey
  
Bangladesh, China, India, Russia
  
Africa
Ethiopia, Morocco, South Africa
  
Ethiopia, Kenya, Morocco, South Africa, Tanzania
  
Europe
France, Germany, Italy, Norway, Scotland
  
Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland
  
Others
Greenland
  
Not Yet Found
  
Deposits in Western Continents
  
  
North America
Canada, Costa Rica, Panama, USA
  
USA
  
South America
Argentina, Brazil, Colombia, Ecuador
  
Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela
  
Deposits in Oceania Continent
  
  
Australia
Central Australia, New Zealand, Queensland
  
New South Wales, New Zealand, Queensland, Victoria, Western Australia
  
Eclogite vs Argillite Characteristics
Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Eclogite vs Argillite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Eclogite and Properties of Argillite. Learn more about Eclogite vs Argillite in the next section. The interior uses of Eclogite include Decorative aggregates and Interior decoration whereas the interior uses of Argillite include Decorative aggregates, Homes and Interior decoration. Due to some exceptional properties of Eclogite and Argillite, they have various applications in construction industry. The uses of Eclogite in construction industry include Not yet used and that of Argillite include Used for flooring, stair treads, borders and window sills..
More about Eclogite and Argillite
Here you can know more about Eclogite and Argillite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Eclogite and Argillite consists of mineral content and compound content. The mineral content of Eclogite includes Amphibole, Coesite, Corundum, Dolomite, Garnet, Kyanite, Lawsonite, Paragonite, Phengite, Pyroxene, Quartz, Rutile, Zoisite and mineral content of Argillite includes Biotite, Chlorite, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyrite, Quartz. You can also check out the list of all Metamorphic Rocks. When we have to compare Eclogite vs Argillite, the texture, color and appearance plays an important role in determining the type of rock. Eclogite is available in black, brown, colourless, green, grey, pink, white colors whereas, Argillite is available in dark grey to black, pink, red, white colors. Appearance of Eclogite is Dull, Banded and Foilated and that of Argillite is Rough and Dull. Properties of rock is another aspect for Eclogite vs Argillite. The hardness of Eclogite is 3.5-4 and that of Argillite is 2-3. The types of Eclogite are Not Available whereas types of Argillite are Not Available. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Eclogite is white while that of Argillite is white to grey. The specific heat capacity of Eclogite is Not Available and that of Argillite is 0.87 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Eclogite is heat resistant whereas Argillite is heat resistant, impact resistant.