thaumasite

noun
thau·ma·site | \ ˈthȯməˌsīt \
plural -s

Definition of thaumasite 

: a white mineral Ca4Al6Si6O24(SO4,CO3,Cl2) consisting of a basic silicate, carbonate, and sulfate of calcium (hardness 3.5, specific gravity 1.88)

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History and Etymology for thaumasite

International Scientific Vocabulary thaumas- (from Greek thaumasios wondrous, from thauma miracle, wonder) + -ite

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