Halite

Halite
Halite from the Wieliczka salt mine, Małopolskie, Poland (size: 16x15x13cm)
General
Category	Halide mineral
Chemical formula	NaCl
Identification
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
References

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.