Torbanite

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Science and technology

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What Wikipedia says

Torbanite, also known historically as boghead coal or kerosene shale, is a variety of fine-grained black oil shale. It usually occurs as lenticular masses, often associated with deposits of Permian coals. Torbanite is classified as lacustrine type oil shale.

Excerpt from the Wikipedia article “Torbanite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Guy WF Loftus, CC BY-SA 4.0, via Wikimedia Commons.