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Silicate

Tsepinite-Sr

(Sr,Ba,K)(Ti,Nb)₂(Si₄O₁₂)(OH,O)₂·3H₂O
Hardness5
Crystal systemMonoclinic
ClassSilicate
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Tsepinite-Sr

Tsepinite-Sr is an IMA-recognized mineral species in the silicate class, with the chemical formula (Sr,Ba,K)(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 2.67; White streak; Vitreous luster; optically biaxial.

IMA symbol Tsp-Sr, IMA status: approved, named in 2004.

Found in cavities formed by hydrothermal alteration of nepheline-syenite pegmatite.

It is found associated with Microcline, albite, natrolite, analcime, aegirine, eudialyte, leifite, vuoriyarvite-K, tsepinite-Ca, kuzmenkoite-Zn, paratsepinite-Ba, takanelite.

The mineral was named to honor Russian microprobe analyst Anatoliy I. Tsepin (b. 1946) and the suffix indicates the Sr-dominant analog of tsepinite-K 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. Browse more T minerals or help write this entry.