Sylvite

minerals

halite

anhydrite

kainite

Formula: KCl
Specific gravity: 1.993
Hardness: 1½ to 2
Streak: White
Colour: Colourless, grey, white, yellowish to reddish, seldom blue or violet
Common impurities: Br,CO2=C,O
Environments:

Evaporite Deposits
Volcanic sublimates

Sylvite occurs in sedimentary basins, forming thick bedded deposits with halite, also as a sublimate in volcanic fumaroles, in which it is a predominant precipitate at 550°C; it occurs in nitrate beds and in cave deposits; it is also a product of burning coal, and it may be included in other minerals as a product of intermediate-grade metamorphism. Associated minerals include halite, kieserite, kainite, carnallite, polyhalite, gypsum and anhydrite HOM, (Mindat).

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