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Halite from the Wieliczka salt mine, Małopolskie, Poland (size: 16x15x13cm)
Category Halide mineral
Chemical formula NaCl
Molecular Weight 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
Refractive index n = 1.544
Optical Properties Isotropic
Streak White
Specific gravity 2.17
Solubility Water soluble
Diaphaneity Transparent
Other Characteristics Salty flavor, Fluorescent

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.

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