steenstrupine
noun
steen·strup·ine
ˈstēnstrəˌpēn,
-nˌstru̇pə̇n
plural -s
: a mineral (La,Ca,Na)(Al,Fe,Mn)(Si,P)(O,OH,F)4(?) consisting of a complex silicate, phosphate, and fluoride of the rare-earth metals, calcium, sodium, aluminum, iron, and manganese, and occurring in dark brown rhombohedral crystals
Word History
Etymology
Danish steenstrupine, from K. J. V. Steenstrup †1913 Danish geologist + Danish -ine