Definition
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
Marl is an unconsolidated sedimentary rock consisting of clay and lime
Origin
Pennsylvania, U.S.
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Discoverer
Unknown
William Smith
Etymology
From Greek anthrakites, from anthrax, anthrak meaning coal
From Old French marle, from Late Latin marglia
Class
Metamorphic Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Soft Rock
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock
Texture
Amorphous, Glassy
Earthy
Color
Black, Brown, Dark Brown, Grey, Light to Dark Grey
Beige, Brown, Green, Grey, White
Durability
Durable
Durable
Appearance
Veined or Pebbled
Rough and Dull
Interior Uses
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Decorative Aggregates, Floor Tiles
Exterior Uses
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As Building Stone, Roof Tiles
Other Architectural Uses
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Curbing
Construction Industry
Cement Manufacture, for Road Aggregate, Making natural cement, Steel Production
Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar
Medical Industry
In Chemical and Pharmaceutical Industry, Manufacture of Aspirins
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Antiquity Uses
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Artifacts, Jewellery, Sculpture, Small Figurines
Commercial Uses
Alumina Refineries, Electricity Generation, Liquid Fuel, Manufacture of Soap, Solvents, Dyes, Plastics and Fibres, Paper Industry
Creating Artwork, Soil Conditioner
Types
Semi-anthracite and Meta-anthracite
Clay Marl ,Blue Marl, Red Marl, High Bank Marl, Shell Layer Marl, Under Shell Layer Marl, Sand Marl, Green Marl, Grey Marl and Clayey Marl
Features
Helps in production of Heat and Electricity, Used as fossil fuel
Generally rough to touch, Is one of the oldest rock, Splintery, Very fine grained 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.
Marl forms when very fine-grained clay particles are deposited in water which settles at the bottom of water bodies and are compacted by overlying sediment; the water squeezes out and hence forming Marl rock.
Mineral Content
Calcite, Clay, Clay Minerals
Calcite, Clay, Dolomite, Gypsum, Micas, Pyrite, Quartz
Compound Content
Carbon, Hydrogen, Nitrogen, Oxygen, Sulphur
Aluminium Oxide, NaCl, CaO, Iron(III) Oxide, Silicon Dioxide
Types of Metamorphism
Burial Metamorphism, Contact Metamorphism, Regional Metamorphism
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Types of Weathering
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Biological Weathering, Chemical Weathering
Types of Erosion
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Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion
Grain Size
Medium to Fine Coarse Grained
Very fine-grained
Fracture
Conchoidal
Conchoidal
Porosity
Less Porous
Highly Porous
Specific Gravity
1.1-1.4
2.2-2.8
Transparency
Opaque
Opaque
Density
1.25-2.5 g/cm3
2.4-2.8 g/cm3
Resistance
Heat Resistant, Water Resistant
Heat Resistant, Impact Resistant
Deposits in Eastern Continents
Asia
Bangladesh, Burma, Cambodia, China, India, Indonesia, Kazakhstan, Malaysia, Mongolia, Pakistan, Turkey, Vietnam
India, Pakistan, Russia
Africa
Botswana, Kenya, Morocco, Mozambique, South Africa, Tanzania
Ethiopia, Kenya, Morocco, South Africa
Europe
Belgium, Bulgaria, England, France, Germany, Greece, Hungary, Kosovo, Netherlands, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, The Czech Republic, Ukraine, United Kingdom
Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland
Deposits in Western Continents
North America
Canada, Mexico, USA
USA
South America
Brazil, Chile, Colombia, Venezuela
Colombia, Ecuador, Peru
Deposits in Oceania Continent
Australia
New South Wales, Queensland, Victoria
New South Wales, Victoria, Western Australia
All about Anthracite and Marl Properties
Know all about Anthracite and Marl properties here. All properties of rocks are important as they define the type of rock and its application. Anthracite belongs to Metamorphic Rocks while Marl belongs to Sedimentary Rocks.Texture of Anthracite is Amorphous, Glassy whereas that of Marl is Earthy. Anthracite appears Veined or Pebbled and Marl appears Rough and Dull. The luster of Anthracite is shiny while that of Marl is dull. Anthracite is available in black, brown, dark brown, grey, light to dark grey colors whereas Marl is available in beige, brown, green, grey, 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 Marl are creating artwork, soil conditioner.