ˈyȯ(r)tˌdäˌlīt, -_dəˌl- noun
( -s )
Etymology: Norwegian hiortdahlit, from T. H. Hiortdahl died 1925 Norwegian chemist + Norwegian -it -ite
: a rare mineral (Ca,Na) 13 Zr 3 Si 9 (O,OH,F) 33 consisting essentially of a sodium calcium zirconium silicate containing also fluorine and occurring as pale yellow tabular triclinic crystals