Halite, also referred to as rock salt, is the source of common table salt. It is the principle solute in sea water.

Halite is found in many modern evaporite deposits where it crystallizes out of evaporating brine lakes. It is also found in ancient evaporite deposits world-wide where large salt lakes and seas have evaporated leaving thick salt deposits.


halite

Chemical composition - NaCl
Hardness - 2.5
Specific gravity - 2.2
Transparency - Transparent to translucent
Colour - Clear to white, can be coloured by contaminants, e.g. blue, purple, pink, yellow, grey
Streak - White
Lustre - Vitreous
Cleavage/fracture - Perfect in three directions / conchoidal
Crystal habit/mode of occurrence - Prismatic (cubes) / massive, granular