Searles lake

Formula: Na3Mg(CO3)2Cl anhydrous carbonate containing halogen
Specific gravity: 2.38
Hardness: 3½
Streak: White
Colour: Colourless, pale yellow, grey, brown
Solubility: Readily soluble in dilute acids with effervescence. Decomposed by hot water with the separation of magnesium carbonate.

Sedimentary environments
Sedimentary environments

Northupite occurs in continental evaporite deposits and in oil shales. At Searles Lake, California, USA it is associated with tychite, pirssonite and rarely burkeite and nahcolite, and at Borax Lake with gaylussite and pirssonite. In drill cores in the oil shales at Green River, Wyoming, USA, it occurs with shortite, bradleyite, trona, pirssonite and gaylussite.

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