Turkestanite
Turkestanite is an IMA-recognized mineral species in the silicate class, with the chemical formula (K, )(Ca,Na)₂ThSi₈O₂₀·nH₂O.
It crystallizes in the tetragonal crystal system (space group P4/mcc). It is a member of the Steacyite structural group.
Key properties: Mohs hardness 5.5–6; specific gravity 3.36; Vitreous luster; optically uniaxial.
IMA symbol Tkt, IMA status: approved, named in 1996.
Found in alkaline to subalkaline massifs.
It is found associated with Microcline, pectolite, quartz, aegirine, calcite.
The name refers to the region, Turkestan Ridge, where the studied material was collected.
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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