1 Definition
1.1 Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
1.3 History
1.3.1 Origin
1.4.2 Discoverer
1.5 Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy
From Greek anthrakites, from anthrax, anthrak meaning coal
1.7 Class
Igneous Rocks
Metamorphic Rocks
2.2.1 Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
2.4 Family
2.4.1 Group
2.6 Other Categories
Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
3 Texture
3.1 Texture
Porphyritic
Amorphous, Glassy
3.2 Color
Blue, Bluish - Grey
Black, Brown, Dark Brown, Grey, Light to Dark Grey
3.3 Maintenance
3.4 Durability
3.4.2 Water Resistant
3.5.1 Scratch Resistant
3.5.2 Stain Resistant
4.1.2 Wind Resistant
4.1.4 Acid Resistant
4.2 Appearance
Foliated
Veined or Pebbled
5 Uses
5.1 Architecture
5.1.1 Interior Uses
Countertops, Decorative Aggregates, Interior Decoration
Not Yet Used
5.2.1 Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration
Not Yet Used
5.3.2 Other Architectural Uses
6.2 Industry
6.2.1 Construction Industry
Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Raw material for the manufacture of mortar
Cement Manufacture, for Road Aggregate, Making natural cement, Steel Production
6.3.1 Medical Industry
Not Yet Used
In Chemical and Pharmaceutical Industry, Manufacture of Aspirins
6.5 Antiquity Uses
6.6 Other Uses
6.6.2 Commercial Uses
Cemetery Markers
Alumina Refineries, Electricity Generation, Liquid Fuel, Manufacture of Soap, Solvents, Dyes, Plastics and Fibres, Paper Industry
7 Types
7.1 Types
Rhyolite
Semi-anthracite and Meta-anthracite
7.2 Features
Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock
Helps in production of Heat and Electricity, Used as fossil fuel
7.3 Archaeological Significance
7.3.2 Monuments
Not Yet Used
Not Yet Used
7.3.4 Famous Monuments
Not Applicable
Not Applicable
7.3.5 Sculpture
Not Yet Used
Not Yet Used
7.3.7 Famous Sculptures
Not Applicable
Not Applicable
7.4.1 Pictographs
8.1.1 Petroglyphs
8.2.2 Figurines
Not Yet Used
Not Yet Used
8.3 Fossils
9 Formation
9.1 Formation
Comendite is a type of Igneous rock which is formed due to cooling and solidification of lava or magma. It may form with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.
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.
9.2 Composition
9.2.1 Mineral Content
Albite, Amphibole, Quartz
Calcite, Clay, Clay Minerals
9.2.3 Compound Content
Al, Fe, Potassium Oxide
Carbon, Hydrogen, Nitrogen, Oxygen, Sulphur
9.3 Transformation
9.3.1 Metamorphism
9.3.3 Types of Metamorphism
Cataclastic Metamorphism, Regional Metamorphism
Burial Metamorphism, Contact Metamorphism, Regional Metamorphism
10.1.2 Weathering
10.1.3 Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Not Applicable
10.1.4 Erosion
10.1.5 Types of Erosion
Coastal Erosion, Water Erosion
Not Applicable
11 Properties
11.1 Physical Properties
11.1.1 Hardness
11.1.3 Grain Size
Medium Grained
Medium to Fine Coarse Grained
11.1.6 Fracture
11.1.8 Streak
11.1.10 Porosity
Highly Porous
Less Porous
11.1.12 Luster
11.1.13 Compressive Strength
11.1.14 Cleavage
Not Available
Non-Existent
11.1.15 Toughness
11.1.16 Specific Gravity
11.1.20 Transparency
11.1.21 Density
Not Available1.25-2.5 g/cm3
0
1400
11.2 Thermal Properties
11.2.1 Specific Heat Capacity
11.3.2 Resistance
Heat Resistant, Impact Resistant
Heat Resistant, Water Resistant
12 Reserves
12.1 Deposits in Eastern Continents
12.1.1 Asia
China
Bangladesh, Burma, Cambodia, China, India, Indonesia, Kazakhstan, Malaysia, Mongolia, Pakistan, Turkey, Vietnam
12.1.2 Africa
East Africa
Botswana, Kenya, Morocco, Mozambique, South Africa, Tanzania
12.1.3 Europe
Italy
Belgium, Bulgaria, England, France, Germany, Greece, Hungary, Kosovo, Netherlands, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, The Czech Republic, Ukraine, United Kingdom
12.1.4 Others
Not Yet Found
Not Yet Found
12.2 Deposits in Western Continents
12.2.1 North America
Not Yet Found
Canada, Mexico, USA
12.2.2 South America
Not Yet Found
Brazil, Chile, Colombia, Venezuela
12.3 Deposits in Oceania Continent
12.3.1 Australia
Queensland
New South Wales, Queensland, Victoria