Kastningite from Silbergrube (Waidhaus, Upper Palatinate, Bavaria, Germany). Field of view 3 mm. — Photo: Leon Hupperichs · CC BY-SA 3.0
Kastningite
Kastningite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Mn²⁺Al₂(PO₄)₂(OH)₂·8H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Stewartite structural group.
Key properties: White streak; Vitreous. Q luster; optically biaxial.
IMA symbol Kng, IMA status: approved, named in 1997.
Found as a rare secondary mineral in a zoned granite pegmatite.
It is found associated with Variscite, paravauxite, albite, mica, quartz.
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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