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Answer for the clue "Rare green to black mineral consisting of hydrated copper arsenate that is found in copper deposits ", 9 letters:
olivenite

Word definitions for olivenite in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) An orthorhombic copper arsenate mineral with the chemical formula Cu 2 AsO 4 OH.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Olivenite \O*liv"en*ite\, n. (Min.) An olive-green mineral, a hydrous arseniate of copper ( Cu2(AsO4)(OH) ); olive ore.

WordNet Word definitions in WordNet
n. rare green to black mineral consisting of hydrated copper arsenate that is found in copper deposits

Wikipedia Word definitions in Wikipedia
Olivenite is a copper arsenate mineral , formula Cu As O O H . It crystallizes in the monoclinic system (pseudo-orthorhombic), and is sometimes found in small brilliant crystals of simple prismatic habit terminated by domal faces. More commonly, it occurs ...