tilasite

noun
til·​as·​ite | \ ˈtiləˌsīt\
plural -s

Definition of tilasite

: a mineral CaMg(AsO4)F consisting of a magnesium calcium arsenate and fluoride and occurring in violet-gray granular masses (specific gravity 3.3)

History and Etymology for tilasite

Swedish tilasit, from Daniel Tilas †1772 Swedish mining engineer + Swedish -it -ite

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