margarosanite

noun

mar·​ga·​ro·​san·​ite

ˌmärgəˈrōsᵊnˌīt

plural -s

: a mineral PbCa₂(SiO₃)₃ consisting of a lead calcium silicate occurring in colorless lamellar masses

Word History

Etymology

Greek margaron pearl + sanis board + English -ite; from its pearly luster and lamellar structure; probably akin to Greek sathē penis, sainein to wag the tail, Old English thūma thumb

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