Paratsepinite-Na
Paratsepinite-Na is an IMA-recognized mineral species in the silicate class, with the chemical formula (Na,Sr,K,Ca)₂(Ti,Nb)₂(Si₄O₁₂)(O,OH)₂·4H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Labuntsovite structural group.
Key properties: specific gravity 2.76; Vitreous luster; optically biaxial.
IMA symbol Ptse-Na, IMA status: approved, named in 2003.
Found in cavities in peralkaline pegmatite.
It is found associated with Analcime, natrolite, tsepinite-Na, catapleiite, apophyllite, fluorite, epididyrnite, sphalerite.
The suffix, Na, indicates the sodium-dominant analogue of paratsepinite-Ba.
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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