Krettnichite
Krettnichite is an IMA-recognized mineral species in the vanadate class, with the chemical formula PbMn³⁺₂(VO₄)₂(OH)₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Natrochalcite structural group.
Key properties: Mohs hardness 4.5; specific gravity 4.04; Brown streak; Adamantine luster.
IMA symbol Knc, IMA status: approved, named in 1998.
Found as a primary accessory ore mineral and as free crystals in vugs within a non- metamorphosed, hydrothermal manganite-quartz vein.
It is found associated with Barite, ankerite, manganite, mottramite, brackebuschite, pyrobelonite.
The name is derived from the locality that provided the first specimens, Krettnich, Germany.
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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