Crossword puzzle clue "shale extract"

Here are the possible solutions for shale extract clue

Answer
Clue
Relevancy
oil
Clue
Shale extract
Definition
to lubricate with a greasy substance
crispyrock
Clue
Brittle shale, say?
kerogen
Clue
Source of shale oil
Oil-producing matter in shale
Definition
a kind of bitumen found in oil shale
kerosene
Clue
Shale oil product
Definition
a fuel oil, also KERO, KEROSINE
kolm
Clue
Swedish shale
longas
Clue
Features of shale and slate?
Definition
LONGA, (Latin) a long note
slaty
Clue
Made of shale.

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