Wiktionary
fluorcaphite
n. (context mineral English) A hexagonal-pyramidal mineral containing calcium, cerium, fluorine, oxygen, phosphorus, sodium, and strontium.
Wikipedia
Fluorcaphite
Fluorcaphite is a mineral with the chemical formula (Ca,Sr,Ce,Na)(PO)F. It is found in the Kola Peninsula in Russia. Its crystals are hexagonal (dipyramidal class). It is light to bright yellow and leaves a white streak. It is transparent and has a vitreous luster. It is rated 5 on the Mohs Scale. Fluorcaphite is radioactive.