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acaustobiolith

Noun CEFR C2

Definitions

A nonflammable organic sedimentary rock.

Equivalents

Examples

“The acaustobiolith components are frequently mixed in with mineral compounds. Acaustobioliths (the mineral phases present⟳ in the oil shale) are mainly composed of limestones, dolomites, some sandstones, and often clays[…]”

CEFR level

C2
Mastery
This word is part of the CEFR C2 vocabulary — mastery level.
See all C2 English words →

See also

acavid Acaxee Acayucan ACBL ACC acc.

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