ˈjänˌstrəˌpīt noun
( -s )
Usage: G johnstrupit, fr. Frederik Johnstrup †1894 Danish mineralogist + G -it -ite
: a mineral approximately (Ca,Na) 3 (Ce,Ti,Zr)Si 2 O 8 F consisting of a complex silicate of cerium and other metals in prismatic crystals (sp. gr. 3.29)