A velvety-black variety of cryptocrystalline quartz, siliceous shale, or similar substance used by jewelers for testing the purity of precious metal, especially gold. ROCKS
AAT
300011149
12yrs ago
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The Fitzwilliam Museum (2024) "Terminology definition for: touchstone" Web page available at: https://data.fitzmuseum.cam.ac.uk/id/terminology/term-37670 Accessed: 2024-04-26 21:44:30
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