ˌkad.əˈplīˌīt noun
( -s )
Etymology: German katapleiit, from Greek kata in the region of, down + pleiōn more + -it -ite; from its occurence together with other rare minerals — more at cata- , pleonasm
: a rare mineral (Na 2 ,Ca)ZrSi 3 O 9 .2H 2 O consisting of hydrous silicate of sodium, calcium, and zirconium occurring in thin tabular yellow or yellowish brown crystals (hardness 6, specific gravity 2.8)