Tsepinite
On this page I show pictures of different 'Tsepinites' Tsepinite-Na Tsepinite-K and Tsepinite-Ca are individual minerals with only a structural relation.
Tsepinite-K from Rischorr.
[Photo: mineralogist.ru]
Small white Tsepinite-Na fibres from Lapkhe Nelm.
[photo/collection: Maurice de Graaf]