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Blue Halite With Sylvite

Blue Halite, also known as blue rock salt, is an extremely rare variety of crystallized sodium chloride. It usually occurs in a cubic form but has also been found as masses, grains, and tiny shards. The galactic color spectrum Blue Halite offers is due to minor impurities of potassium within the salt’s chemical composition.

The largest deposit of Blue Halite is located in Saskatchewan, Canada, formed during the evaporation of a large ocean that existed around 400 million years ago. Other important localities include deposits in the southern United States, Pakistan, Germany, Spain, Iran, Romania, and the United Kingdom.

Blue Halite With Sylvite

Blue Halite With Sylvite. Locality: Carlsbad Potash District, Eddy & Lea Counties, New Mexico, USA Photo: Joe Budd.

Luster: Vitreous

Chemical Composition: NaCl

Streak: White
Cleavage: Perfect, three directions cubic
Specific gravity: 2.17
Fracture: Conchoidal
Crystal system: Cubic/Isometric

Mohs scale hardness: 2.0–2.5

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