Specific gravity: 1.993
Hardness: 1½ to 2
Colour: Colourless, grey, white, yellowish to reddish, seldom blue or violet
Sylvite forms in evaporite deposits. It may also deposit from volcanic gas, in which it is a predominant
precipitate at 550°C.
It sometimes contains minute halite inclusions oriented in a parallel position to the sylvite.
Common impurities: Br,CO2=C,O
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