ˈthȯməˌsīt noun
( -s )
Etymology: International Scientific Vocabulary thaumas- (from Greek thaumasios wondrous, from thauma miracle, wonder) + -ite — more at theater
: a white mineral Ca 4 Al 6 Si 6 O 24 (SO 4 ,CO 3 ,Cl 2 ) consisting of a basic silicate, carbonate, and sulfate of calcium (hardness 3.5, specific gravity 1.88)