tritomite

noun

trit·​o·​mite

ˈtritəˌmīt

plural -s

: a complex fluosilicate chiefly of calcium, thorium, cerium, yttrium, and containing boron

Word History

Etymology

German tritomit, from Greek tritomos thrice cut + German -it -ite; from the fact that the crystals leave trihedral cavities in the gangue

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