Space-filling model of the calcium chloride dihydrate (sinjarite). — Photo: Hoa112008 · Public domain
Sinjarite
Natural calcium chloride dihydrate — a deliquescent mineral from Iraq.
Intro adapted from Wikipedia (CC BY-SA).
Sinjarite is an IMA-recognized mineral species in the halide class, with the chemical formula CaCl₂·2H₂O.
It crystallizes in the orthorhombic crystal system (space group Pbcn).
Key properties: Mohs hardness 1.5; specific gravity 1.66; White streak; Vitreous to resinous luster.
IMA symbol Snj, IMA status: approved, named in 1979.
Found in a dry stream bed, apparently precipitated from groundwater.
The name refers to a town near the occurrence, Sinjar, Iraq.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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