stainierite

noun
stai·​nier·​ite | \ ˈstīnēəˌrīt, stīˈniˌr-\
plural -s

Definition of stainierite

: a rare mineral CoO(OH) consisting of cobalt oxide-hydroxide and occurring in black mammillary masses

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History and Etymology for stainierite

Dutch stainieriet, from Xavier Stainier, 20th century Belgian geologist + Dutch -iet -ite

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