Bituminous coal
Rock
Also called Soft coal
About it
The commonest coal: black, banded with bright and dull layers, light in the hand, and leaving a black streak; it burns with a smoky flame. Mined in Appalachia, Alberta, and the Elk Valley of British Columbia.
- Type
- Rock (sedimentary)
- Group
- Sedimentary (organic)
- Specific gravity
- 1.2–1.5
- Streak
- black
- Lustre
- vitreous (glassy), dull
- Colours
- black, banded bright and dull
- Transparency
- opaque
- Cleavage and fracture
- blocky, breaking along cleats
Typical values: real specimens vary. For more, see mindat.org.