Calciolangbeinite
Calciolangbeinite is an IMA-recognized mineral species in the sulfate class, with the chemical formula K₂Ca₂(SO₄)₃.
It crystallizes in the cubic crystal system (space group P2_13). It is a member of the Langbeinite structural group.
Key properties: Mohs hardness 3–3.5; specific gravity 2.68; White streak; Vitreous luster.
IMA symbol Clgb, IMA status: approved, named in 2011.
Found in sublimate crusts around a volcanic fumarole on an active scoria cone.
It is found associated with Langbeinite, piypite, hematite, Fe- and Sb-bearing rutile, pseudobrookite, As- and Zn- bearing orthoclase in solid solution with filatovite, lyonsite.
As the Ca-dominant analog of langbeinite.
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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