Giniite
Giniite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Fe²⁺Fe³⁺₄(PO₄)₄(OH)₂·2H₂O.
It crystallizes in the monoclinic crystal system (space group Cmmm).
Key properties: Mohs hardness 3–4; specific gravity 3.41; Olive-green streak; Vitreous to greasy luster; optically biaxial.
IMA symbol Gin, IMA status: approved, named in 1977.
Found as a secondary mineral in a complex granite pegmatite.
It is found associated with Triphylite, barbosalite, huréaulite, leucophosphite, phosphosiderite, mélonjosephite, tavorite, whitlockite, monetite.
The mineral was named to honor Adelheid (Gini) Keller (1940–), wife of Paul Keller.
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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