Bituminous Coal
What is Bituminous Coal?
Bituminous coal is a relatively soft coal containing a tar-like substance called bitumen or asphalt. It is of higher quality than lignite coal but of lower quality than anthracite coal. It is typically black or brownish-black and often has visible bands or layers. Bituminous coal is a sedimentary rock formed from the compression of peat over millions of years. It is a significant source of energy and is used primarily as fuel in power plants to generate electricity and in the production of coke for the steel industry.
Optical Properties
- Refractive Index
- Not applicable, as it is opaque.
- Birefringence
- Not applicable, as it is opaque.
- Pleochroism
- Not applicable, as it is opaque.
- Optical Character
- Opaque
- Dispersion
- Not applicable, as it is opaque.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Bituminous Coal before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Bituminous Coal Localities Map
See where Bituminous Coal is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Black to brownish-black
- Hardness (Mohs)
- 2.5 to 3.0
- Density
- 1.2 to 1.4 g/cm³
- Streak
- Brown to black
Chemical Properties
- Chemical Formula
- Variable, but can be represented as a complex mixture of hydrocarbons.
- Elements
- Carbon, hydrogen, oxygen, nitrogen, sulfur, and various trace elements.
Also Known As
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Bituminous Coal FAQs
How do I identify Bituminous Coal?
Bituminous Coal can be identified by its hardness of 2.5 to 3.0 on the Mohs scale, Black to brownish-black color. Look for these key characteristics when examining specimens.
What color is Bituminous Coal?
Bituminous Coal typically appears in Black to brownish-black. Color can vary depending on impurities and formation conditions.
How hard is Bituminous Coal?
Bituminous Coal has a hardness of 2.5 to 3.0 on the Mohs scale. This makes it a soft mineral that can be scratched easily.