Definition
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
  
Adakite is an intermediate to felsic volcanic rock that has geochemical characteristics of magma which is said to be formed by partial melting of altered basalt that is subducted below volcanic arcs
  
History
  
  
Origin
Pennsylvania, U.S.
  
Adak, Aleutian Islands
  
Discoverer
Unknown
  
Defant and Drummond
  
Etymology
From Greek anthrakites, from anthrax, anthrak meaning coal
  
From Adak, Aleutian Islands
  
Class
Metamorphic Rocks
  
Igneous Rocks
  
Sub-Class
Durable Rock, Soft Rock
  
Durable Rock, Medium Hardness Rock
  
Family
  
  
Group
Not Applicable
  
Volcanic
  
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
  
Fine Grained Rock, Medium Grained Rock, Opaque Rock
  
Texture
Amorphous, Glassy
  
Porphyritic
  
Color
Black, Brown, Dark Brown, Grey, Light to Dark Grey
  
Black, Brown, Light to Dark Grey
  
Maintenance
Less
  
Less
  
Durability
Durable
  
Durable
  
Water Resistant
No
  
No
  
Scratch Resistant
No
  
No
  
Stain Resistant
No
  
No
  
Wind Resistant
No
  
Yes
  
Acid Resistant
No
  
Yes
  
Appearance
Veined or Pebbled
  
Dull and Soft
  
Architecture
  
  
Interior Uses
Not Yet Used
  
Decorative Aggregates, Floor Tiles, Homes, Hotels, Kitchens
  
Exterior Uses
Not Yet Used
  
As Building Stone, As Facing Stone, Office Buildings
  
Other Architectural Uses
Not Yet Used
  
Whetstones
  
Industry
  
  
Construction Industry
Cement Manufacture, for Road Aggregate, Making natural cement, Steel Production
  
As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone
  
Medical Industry
In Chemical and Pharmaceutical Industry, Manufacture of Aspirins
  
Not Yet Used
  
Antiquity Uses
Not Yet Used
  
Monuments, Sculpture, Small Figurines
  
Other Uses
  
  
Commercial Uses
Alumina Refineries, Electricity Generation, Liquid Fuel, Manufacture of Soap, Solvents, Dyes, Plastics and Fibres, Paper Industry
  
Commemorative Tablets, Pottery, Used in aquariums
  
Types
Semi-anthracite and Meta-anthracite
  
Not Available
  
Features
Helps in production of Heat and Electricity, Used as fossil fuel
  
Has High structural resistance against erosion and climate, Host rock for Diamond, Very fine grained 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
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.
  
Adakite rocks are formed when the hydrous fluids are released from minerals that break down in metamorphosed basalt, and rise into the mantle they initiate partial melting.
  
Composition
  
  
Mineral Content
Calcite, Clay, Clay Minerals
  
Olivine, Plagioclase, Pyroxene
  
Compound Content
Carbon, Hydrogen, Nitrogen, Oxygen, Sulphur
  
Aluminium Oxide, MgO, Silicon Dioxide
  
Transformation
  
  
Metamorphism
Yes
  
Yes
  
Types of Metamorphism
Burial Metamorphism, Contact Metamorphism, Regional Metamorphism
  
Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism
  
Weathering
No
  
Yes
  
Types of Weathering
Not Applicable
  
Chemical Weathering, Mechanical Weathering
  
Erosion
No
  
Yes
  
Types of Erosion
Not Applicable
  
Coastal Erosion, Sea Erosion, Water Erosion
  
Physical Properties
  
  
Hardness
1-1.5
  
3-4
  
Grain Size
Medium to Fine Coarse Grained
  
Fine to Medium Grained
  
Fracture
Conchoidal
  
Conchoidal
  
Streak
Black
  
Bluish Black
  
Porosity
Less Porous
  
Less Porous
  
Luster
Shiny
  
Grainy, Pearly and Vitreous
  
Cleavage
Non-Existent
  
Not Available
  
Toughness
Not Available
  
Not Available
  
Specific Gravity
1.1-1.4
  
Not Available
  
Transparency
Opaque
  
Opaque
  
Density
1.25-2.5 g/cm3
  
Not Available
  
Thermal Properties
  
  
Specific Heat Capacity
1.32 kJ/Kg K
  
4
Not Available
  
Resistance
Heat Resistant, Water Resistant
  
Heat Resistant, Pressure Resistant, Wear Resistant
  
Deposits in Eastern Continents
  
  
Asia
Bangladesh, Burma, Cambodia, China, India, Indonesia, Kazakhstan, Malaysia, Mongolia, Pakistan, Turkey, Vietnam
  
India, Russia
  
Africa
Botswana, Kenya, Morocco, Mozambique, South Africa, Tanzania
  
Ethiopia, Somalia, South Africa
  
Europe
Belgium, Bulgaria, England, France, Germany, Greece, Hungary, Kosovo, Netherlands, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, The Czech Republic, Ukraine, United Kingdom
  
Iceland
  
Others
Not Yet Found
  
Not Yet Found
  
Deposits in Western Continents
  
  
North America
Canada, Mexico, USA
  
Canada, USA
  
South America
Brazil, Chile, Colombia, Venezuela
  
Brazil
  
Deposits in Oceania Continent
  
  
Australia
New South Wales, Queensland, Victoria
  
Not Yet Found
  
Anthracite vs Adakite 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. Anthracite vs Adakite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Anthracite and Properties of Adakite. Learn more about Anthracite vs Adakite in the next section. The interior uses of Anthracite include Not yet used whereas the interior uses of Adakite include Decorative aggregates, Floor tiles, Homes, Hotels and Kitchens. Due to some exceptional properties of Anthracite and Adakite, they have various applications in construction industry. The uses of Anthracite in construction industry include Cement manufacture, For road aggregate, Making natural cement, Steel production and that of Adakite include As dimension stone, Cobblestones, Rail track ballast, Roadstone.
More about Anthracite and Adakite
Here you can know more about Anthracite and Adakite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Anthracite and Adakite consists of mineral content and compound content. The mineral content of Anthracite includes Calcite, Clay, Clay Minerals and mineral content of Adakite includes Olivine, Plagioclase, Pyroxene. You can also check out the list of all Metamorphic Rocks. When we have to compare Anthracite vs Adakite, the texture, color and appearance plays an important role in determining the type of rock. Anthracite is available in black, brown, dark brown, grey, light to dark grey colors whereas, Adakite is available in black, brown, light to dark grey colors. Appearance of Anthracite is Veined or Pebbled and that of Adakite is Dull and Soft. Properties of rock is another aspect for Anthracite vs Adakite. The hardness of Anthracite is 1-1.5 and that of Adakite is 3-4. The types of Anthracite are Semi-anthracite and Meta-anthracite whereas types of Adakite are Not Available. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Anthracite is black while that of Adakite is bluish black. The specific heat capacity of Anthracite is 1.32 kJ/Kg K and that of Adakite is Not Available. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Anthracite is heat resistant, water resistant whereas Adakite is heat resistant, pressure resistant, wear resistant.