Halite

Chemical Formula : NaCl
Hardness : 2.5
Cleavage : Three, perfect
Luster : Vitreous
Color : Colorless, white, gray, yelow, or red.
Streak : White
Density : 2.164
Diagnostic Features and Trivia : This mineral is easily identified by being salty to the taste and its cubic crystals and cleavage.
Crystal System and Habit : Isometric; commonly forming cubes often with steps or hollows.
Twinning : None
Polymorphs : None
Index of Refraction : 1.544