catapleiite
noun
cat·a·plei·ite
ˌkatəˈplīˌīt
plural -s
: a rare mineral (Na2,Ca)ZrSi3O9.2H2O consisting of hydrous silicate of sodium, calcium, and zirconium occurring in thin tabular yellow or yellowish brown crystals (hardness 6, specific gravity 2.8)
Word History
Etymology
German katapleiit, from Greek kata in the region of, down + pleiōn more + -it -ite; from its occurrence together with other rare minerals