Chlorocalcite
(repeating unit)KCaCl3 IMA symbol Ccal[1] Strunz classification 3.AA.40 Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group Pnma (from synthetic crystals) Unit cell a = 7.35 Å, b = 10.44 Å,
c = 7.25 Å; Z = 4 Identification Formula mass 185.54 g/mol Color White, tinged violet Crystal habit Prismatic or tabular cube-like crystals, pseudo cubic Cleavage Perfect on {001}, good on {010} and {100} Mohs scale hardness 2.5-3 Diaphaneity Transparent to semi-transparent Density 2.16 calculated Optical properties Biaxial (–) Refractive index ~1.52 Birefringence weak Solubility In water Other characteristics Deliquescent References [2][3][4][5]
H-M symbol: (2/m 2/m 2/m)
c = 7.25 Å; Z = 4
Chlorocalcite is a rare potassium calcium chloride evaporite mineral with formula: KCaCl3. It is found in active volcanic fumaroles.
It was first described in 1872 for an occurrence on Mount Vesuvius and given the name for its calcium content previous to discovering that it also contained potassium.[3][4] It has also been reported from the Desdemona Mine, Peine, Lower Saxony, Germany.[3]
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