Etymology

cornubite

C3O1R1N1U1B3I1T1E1

Today it means: A mineral containing arsenic, copper, hydrogen, and oxygen with chemical formula Cu₅(AsO₄)₂(OH)₄. Full definition →

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The story

From Cornubia (“medieval Latin name of Cornwall”) + -ite.

Etymology from Wiktionary, CC BY-SA 4.0.