What is the mineral halite more commonly known as? what color is it?

Halite commonly known as rock salt, is a type of salt, the mineral form of sodium chloride (NaCl). Halite forms isometric crystals. The mineral is typically colourless or white, but may also be light blue, dark blue, purple, pink, red, orange, yellow or Gray depending on the amount and type of impurities. It commonly occurs with other evaporate deposit minerals such as several of the sulphates, halides, and borates.
rock salt is a rainbow of colours. 
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C- a hypothesis or d- an observation