Sulphohalite

sulphate

hanksite

Formula: Na6(SO4)2ClF anhydrous sulphate containing halogen
Specific gravity: 2.505
Hardness: 3½
Streak: White
Colour: Colourless, gray, greenish yellow; colourless in transmitted light
Solubility: Slowly soluble in cold water
Environments:

Sedimentary environments

Sulphohalite occurs in lacustrine (lake) evaporite deposits. At Searles Lake, California, USA it occurs with hanksite. It is abundant at the Otjiwalundo salt pan, Namibia, where it occurs trona, thénardite and pirssonite.

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