Karasugite
Karasugite is an IMA-recognized mineral species in the halide class, with the chemical formula SrCaAlF₇.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: specific gravity 3.06–3.11; White streak; Vitreous luster; optically biaxial.
IMA symbol Krg, IMA status: approved, named in 1993.
A secondary mineral formed in fissures in the oxidation zone of veins of iron ores in tectonic breccias.
It is found associated with Gearksutite, tikhonenkovite, fluorite, barian celestine, “limonite”, hematite, quartz.
The name refers to its occurrence in the Karasug deposit, Russia.
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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