Görgeyite
Görgeyite is an IMA-recognized mineral species in the sulfate class, with the chemical formula K₂Ca₅(SO₄)₆·H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 3.5–4; specific gravity 2.9–2.93; Vitreous luster; optically biaxial.
IMA symbol Gög, grandfathered status — known before the IMA’s founding, named in 1953.
Typically an uncommon secondary mineral in evaporite deposits; in hydrothermal veins.
It is found associated with Glauberite, halite, polyhalite, anhydrite, gypsum (evaporites); cesanite, pyrite (Cesano, Italy).
The mineral was named to honor Rolf von Görgey (1886–1915), mineralogist specializing in Austrian salt deposits.
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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