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Formula: Na2(PO3OH).2H2O
Hydrated acid phosphate
Specific gravity: 1.98 to 2.00
Hardness: 1 to 1½
Streak: White
Colour: White
Solubility: Very soluble in water
Environments
Plutonic igneous environments
Pegmatites
Localities
At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada, dorfmanite occurs
in sodalite xenoliths associated with an intrusive alkalic
gabbro-syenite complex. Associated
minerals include sodalite, villiaumite,
eudialyte, lovozerite and
ussingite
(HOM).
There are two co-type localities, the Koashva Open Pit, Koashva Mt, and the Material'naya Adit, Yukspor Mt, both at the
Khibiny Massif, Murmansk Oblast, Russia. Here dorfmanite has been noted in drill cores into alkalic
pegmatites in differentiated alkalic massifs, as an alteration product
of lomonosovite and nacaphite.
Associated minerals include lomonosovite,
olympite and villiaumite
(AM 66.217-218, HOM).
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