Northupite

northupite

tychite

pirssonite

burkeite

Images
Formula: Na3Mg(CO3)2Cl
Anhydrous carbonate containing halogen
Crystal System: Isometric
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 (Mindat).
Environments:

Evaporite deposits

Northupite occurs in continental evaporite deposits and in oil shales.

Localities

At Borax Lake, Clear Lake Oaks, Sulphur Creek Mining District, Lake County, California, USA, northupite is associated with gaylussite and pirssonite (Dana).
Northupite from Borax Lake - Image

At Searles Lake, San Bernardino County, California, USA, northupite is associated with tychite, pirssonite and rarely burkeite and nahcolite (Dana).
Northupite from Searles Lake - Image

At Green River, Sweetwater County, Wyoming, USA, northupite occurs in drill cores in the oil shales associated with shortite, bradleyite, trona, pirssonite and gaylussite (Dana).

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