Haigerachite
Haigerachite is an IMA-recognized mineral species in the phosphate class, with the chemical formula KFe³⁺₃(H₂PO₄)₆(HPO₄)₂·4H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 2; specific gravity 2.44; White streak; Vitreous luster; optically biaxial.
IMA symbol Hga, IMA status: approved, named in 1997.
A secondary phosphate formed on a mine dump.
It is found associated with Quartz, pyrite, gypsum, jarosite, diadochite, gengenbachite.
The name refers to the village and valley near the mine.
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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