Jørgensenite
Jørgensenite is an IMA-recognized mineral species in the halide class, with the chemical formula Na₂Sr₁₄Na₂Al₁₂F₆₄(OH)₄.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Jarlite structural group.
Key properties: Mohs hardness 3.5–4; specific gravity 3.89; White streak; Vitreous luster; optically biaxial.
IMA symbol Jør, IMA status: approved, named in 1995.
Found in vugs and as fissure fillings in a cryolite deposit with other fluorides.
It is found associated with Jarlite, stenonite, thomsenolite, gearksutite, topaz, muscovite.
The name refers to Vilhelm Jørgensen (1844–1925), cofounder, in 1870, of the cryolite factory at Ivigtut, Greenland.
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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