Trona

trona

thermonatrite

nahcolite

natron

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Formula: Na₃(HCO₃)(CO₃).2H₂O
Carbonate
Crystal System: Monoclinic
Specific gravity: 2.11 measured, 2.124 calculated
Hardness: 2
Streak: White
Colour: Colourless, grey, yellow-white
Solubility: Soluble in water; effervesces in acids
Environments:

Evaporite Deposits (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

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

In Green River oil shales, Wyoming, USA, trona occurs with shortite, northupite, bradleyite and pirssonite. The deposit is a lacustrine (lake) deposit (Dana).

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