Giftgrubeite
Giftgrubeite is an IMA-recognized mineral species in the arsenate class, with the chemical formula CaMn₂Ca₂(AsO₄)₂(AsO₃OH)₂·4H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Hureaulite structural group.
Key properties: Mohs hardness 3.5; specific gravity 3.23; White streak; Vitreous luster; optically biaxial.
IMA symbol Gif, IMA status: approved, named in 2017.
A secondary mineral, produced through alteration of arsenical minerals after mining.
It is found associated with Arsenolite, picropharmacolite, pharmacolite, ± haidingerite, chongite, scorodite, Mn-bearing calcite, native arsenic, löllingite.
The name refers to the mine that yielded the studied material.
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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