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Formula: Na2Ca(CO3)2.2H2O hydrated normal carbonate
Crystal System: Orthorhombic
Specific gravity: 2.352 measured, 2.37 calculated
Hardness: 3 to 3½
Streak: White
Colour: Colourless, white, greyish
Solubility: Soluble in cold dilute acids with effervescence
Environments
Pirssonite is an evaporite mineral.
Localities
At the Otjiwalundo Salt Pan, Kunene Region, Namibia, pirssonite occurs with trona
and thénardite.
At Borax Lake, California, USA, pirssonite occurs with
northupite, tychite and
gaylussite.
Near Green River, Wyoming, USA, pirssonite has been recovered from drill cores with
shortite,
bradleyite, northupite,
gaylussite and trona.
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