Tsepinite-K
Tsepinite-K is an IMA-recognized mineral species in the silicate class, with the chemical formula (K,Ba,Na)₂(Ti,Nb)₂(Si₄O₁₂)(OH,O)₂·3H₂O.
It crystallizes in the monoclinic crystal system (space group Cm). It is a member of the Labuntsovite structural group.
Key properties: Mohs hardness 5; specific gravity 2.88; [White.] streak; Vitreous luster; optically biaxial.
IMA symbol Tsp-K, IMA status: approved, named in 2002.
Found in cavities formed by hydrothermal alteration of alkaline pegmatite.
It is found associated with Other labunstovite-group minerals, aegirine, manganneptunite, natrolite, chabazite-Ca, yofortierite, nontronite, kaolinite-group minerals.
Suffix indicates the K-dominant analog of tsepinite-Na and tsepinite-Ca.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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