Formula: Na2Ca(CO3)2.2H2O hydrated normal carbonate
Specific gravity: 2.352
Hardness: 3 to 3½
Colour: Colourless, white, greyish
Solubility: Soluble in cold dilute acids with effervescence
Pirssonite is an evaporite mineral.
At the Otjiwalundo Salt Pan, Kunene Region, pirssonite occurs with trona and thénardite.
At Borax Lake, California, pirssonite occurs with northupite, tychite and gaylussite.
Near Green River, Wyoming, it has been recovered from drill cores with shortite, bradleyite, northupite, gaylussite and trona.
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