Trona

carbonate

natron

Formula: Na3(HCO3)(CO3).2H2O, acid carbonate
Specific gravity: 2.14
Hardness: 2
Streak: White
Colour: Colourless, grey, yellow-white
Solubility: Soluble in water; effervesces in acids
Environments:

Sedimentary environments (typical)

Trona occurs in lacustrine (lakes) evaporite deposits, and also as an efflorescence on soils in arid regions. It is commonly associated with natron, thermonatrite, nahcolite, halite, glauberite, thénardite, mirabilite and gypsum.

Localities

USA At Searles Lake, California, trona occurs with borax, hanksite, thénardite and others.

In Green River oil shales, Wyoming, it occurs with shortite, northupite, bradleyite and pirssonite.

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