A variety of chalcedony silica mineral differing from agate only in the straightness of the layers; usually white and black, or white and red. MH
This term has 44 records attributed within our system.
AAT
Material
300011136
13yrs ago
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The Fitzwilliam Museum (2025) "Terminology definition for: onyx" Web page available at: https://data.fitzmuseum.cam.ac.uk/id/terminology/term-34938 Accessed: 2025-07-20 17:33:33
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