Definition
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
Anorthosite is a granular igneous rock composed largely of labradorite or plagioclase
Origin
Pennsylvania, U.S.
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Discoverer
Unknown
Unknown
Etymology
From Greek anthrakites, from anthrax, anthrak meaning coal
From French anorthose plagioclase + -ite1
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock
Texture
Amorphous, Glassy
Foliated, Glassy
Color
Black, Brown, Dark Brown, Grey, Light to Dark Grey
Black, Bluish - Grey, Brown, Green, Grey, Light Greenish Grey, Pink, White
Durability
Durable
Durable
Appearance
Veined or Pebbled
Layered, Banded, Veined and Shiny
Interior Uses
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Decorative Aggregates, Floor Tiles, Homes, Interior Decoration
Exterior Uses
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As Building Stone, As Facing Stone, Garden Decoration
Other Architectural Uses
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Curbing
Construction Industry
Cement Manufacture, for Road Aggregate, Making natural cement, Steel Production
As Dimension Stone, Cement Manufacture, for Road Aggregate
Medical Industry
In Chemical and Pharmaceutical Industry, Manufacture of Aspirins
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Antiquity Uses
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Artifacts, Sculpture, Small Figurines
Commercial Uses
Alumina Refineries, Electricity Generation, Liquid Fuel, Manufacture of Soap, Solvents, Dyes, Plastics and Fibres, Paper Industry
Creating Artwork, Curling
Types
Semi-anthracite and Meta-anthracite
Proterozoic Anorthosite and Archean Anorthosite
Features
Helps in production of Heat and Electricity, Used as fossil fuel
Generally rough to touch, Is one of the oldest rock
Archaeological Significance
Formation
Anthracite forms from the accumulation of plant debris in a swamp environment. When plant debris dies and falls into the swamp, the standing water of the swamp protects it from decay.
Anorthosite is a phaneritic, intrusive igneous rock which is characterized by a predominance of plagioclase feldspar which is almost 90–100%, and a minimal mafic component.
Mineral Content
Calcite, Clay, Clay Minerals
Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene
Compound Content
Carbon, Hydrogen, Nitrogen, Oxygen, Sulphur
Ca, CaO, Chromium(III) Oxide, MgO, Sulfur Trioxide
Types of Metamorphism
Burial Metamorphism, Contact Metamorphism, Regional Metamorphism
Cataclastic Metamorphism, Contact Metamorphism
Types of Weathering
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Biological Weathering
Types of Erosion
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Chemical Erosion, Wind Erosion
Grain Size
Medium to Fine Coarse Grained
Coarse Grained
Fracture
Conchoidal
Irregular
Porosity
Less Porous
Less Porous
Luster
Shiny
Pearly to Subvitreous
Specific Gravity
1.1-1.4
2.62-2.82
Transparency
Opaque
Translucent
Density
1.25-2.5 g/cm3
2.7-4 g/cm3
Resistance
Heat Resistant, Water Resistant
Heat Resistant, Impact Resistant, Pressure Resistant, Scratch Resistant, Wear Resistant
Deposits in Eastern Continents
Asia
Bangladesh, Burma, Cambodia, China, India, Indonesia, Kazakhstan, Malaysia, Mongolia, Pakistan, Turkey, Vietnam
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Africa
Botswana, Kenya, Morocco, Mozambique, South Africa, Tanzania
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Europe
Belgium, Bulgaria, England, France, Germany, Greece, Hungary, Kosovo, Netherlands, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, The Czech Republic, Ukraine, United Kingdom
Bulgaria, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Malta, Poland, Portugal, Romania, Slovenia, Spain, Sweden, The Czech Republic
Deposits in Western Continents
North America
Canada, Mexico, USA
Canada
South America
Brazil, Chile, Colombia, Venezuela
Bolivia, Colombia
Deposits in Oceania Continent
Australia
New South Wales, Queensland, Victoria
Central Australia, South Australia, Western Australia
All about Anthracite and Anorthosite Properties
Know all about Anthracite and Anorthosite properties here. All properties of rocks are important as they define the type of rock and its application. Anthracite belongs to Metamorphic Rocks while Anorthosite belongs to Igneous Rocks.Texture of Anthracite is Amorphous, Glassy whereas that of Anorthosite is Foliated, Glassy. Anthracite appears Veined or Pebbled and Anorthosite appears Layered, Banded, Veined and Shiny. The luster of Anthracite is shiny while that of Anorthosite is pearly to subvitreous. Anthracite is available in black, brown, dark brown, grey, light to dark grey colors whereas Anorthosite is available in black, bluish - grey, brown, green, grey, light greenish grey, pink, white colors. The commercial uses of Anthracite are alumina refineries, electricity generation, liquid fuel, manufacture of soap, solvents, dyes, plastics and fibres, paper industry and that of Anorthosite are creating artwork, curling.