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Halite from the Wieliczka salt mine, Małopolskie, Poland (size: 16x15x13cm)
Category Halide mineral
(repeating unit)
Strunz classification 03.AA.20
Crystal symmetry Isometric hexoctahedral 4/m 3 2/m
Unit cell a = 5.6404(1) Å; Z = 4
Formula mass 58.433 g/mol
Color Colorless or white; also blue, purple, red, pink, yellow, orange, or gray
Crystal habit Predominantly cubes and in massive sedimentary beds, but also granular, fibrous and compact
Crystal system Cubic
Cleavage Perfect {001}, three directions cubic
Fracture Conchoidal
Tenacity Brittle
Mohs scale hardness 2 - 2.5
Luster Vitreous
Streak White
Diaphaneity Transparent
Specific gravity 2.17
Optical properties Isotropic
Refractive index n = 1.544
Solubility Water soluble
Other characteristics Salty flavor, Fluorescent
References [1][2][3]

Halite is the mineral a lot of people call "rock salt". It is a different form of sodium chloride (NaCl). It looks like it is made out of cubes.

References[change | change source]