Noun
Any of a group of related minerals in the vuoriyarvite group
tsepinite-Ca [Ca(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O]
tsepinite-K [K2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O]
tsepinite-Na [Na2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O]
tsepinite-Sr [Sr(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O]
Source: en.wiktionary.org