Chukhrovite-(Ca)
Chukhrovite-(Ca) is an IMA-recognized mineral species in the sulfate class, with the chemical formula Ca₃Ca₁.₅Al₂(SO₄)F₁₃·12H₂O.
It crystallizes in the cubic crystal system (space group Fd3). It is a member of the Chukhrovite structural group.
Key properties: Mohs hardness 3.5; specific gravity 2.23; White streak; Vitreous luster.
IMA symbol Chk-Ca, IMA status: approved, named in 2010.
From low-temperature hydrothermal crystallization on the surfaces of fractures crosscutting a vein of marcasite and REE-bearing fluorite.
It is found associated with Marcasite, REE-bearing fluorite, gypsum, hydrated Fe oxides, galena, sphalerite.
The name refers to the Ca-dominant species of the chukhrovite mineral group.
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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