bn:00145399n
Noun Concept
Categories: Coal, Oil shale geology
EN
torbanite  Algal boghead  Boghead coal  Boghead coals  Stellarite
EN
Torbanite, also known as boghead coal or channel coal, is a variety of fine-grained black oil shale. Wikipedia
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EN
Torbanite, also known as boghead coal or channel coal, is a variety of fine-grained black oil shale. Wikipedia
A variety of coal, derived from colonial algae, that looks like carbonaceous shale. Wiktionary
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