Searles lake

Formula: KNa22(SO4)9(CO3)2Cl Anhydrous compound sulphate containing halide
Specific gravity: 2.562
Hardness: 3 to 3½
Streak: White
Colour: Colourless to grey, yellow or almost black; colourless in transmitted light
Solubility: Readily soluble in water, effervesces weakly in dilute acids

Sedimentary environments

Hanksite occurs in lacustrine (lake) evaporite deposits. It is abundant at Searles Lake, California, USA, associated with halite, borax, trona and aphthitalite.

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