Antarcticite
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Antarcticite is an uncommon calcium chloride hexahydrate mineral with formula CaCl₂·6H₂O. It forms colorless acicular trigonal crystals. It is hygroscopic and has a low specific gravity of 1.715. Wikipedia
Category: Halide mineral
Cleavage: Perfect on, very good on
Color: Colorless
Crystal class: Trapezohedral (32); H-M symbol: (32)
Crystal habit: Occurs as groups of acicular crystals
Crystal system: Trigonal
Optical properties: Uniaxial (-)
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