Nahcolite

carbonate

thermonatrite

Formula: NaH(CO3) acid carbonate
Specific gravity: 2.21
Hardness: 2½
Streak: White
Colour: Colourless, white, grey, buff
Solubility: Readily soluble in water forming an alkaline solution that gives off carbon dioxide when heated. Also soluble in glycerine.
Environments

Sedimentary environments

Nahcolite is a lacustrine (lake) evaporite mineral.

In old Roman conduit at Naples, Italy, nahcolite occurs admixed with trona and thermonatrite as an efflorescence.

gaylussite, and as alteration rims around thermonatrite.

At Searles Lake, California, nahcolite occurs in thin beds associated with gaylussite, thénardite, burkeite, northupite, borax and halite.

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