NaHPO · 2H
Dorfmanite is a very rare occurrence at Mont Saint-Hilaire. It is undistinguishable from other powdery white species such as brockite, cerussite, kaolinite, montmorillonite, nahpoite, natrophosphate, szomolnokite, thermonatrite and trona.
Color is usually white.
Luster is vitreous to earthy.
Diaphaneity is translucent.
Crystal System is orthorhombic; (??).
Crystal Habits include powdery fillings and compact blobs.
Cleavage none apparent.
Fracture is (??).
Hardness is 1 – 1.5
Specific Gravity is approximately 2.0 g/cm
Streak is white.
Associated Minerals include aegirine, eudialyte, lovozerite, nahpoite,
natrolite, pectolite, quartz, sodalite, ussingite and villiaumite.
Distinguishing Features: none from other white powders at MSH.
Origin: Named in 1980 after Moisei Davydovich Dorfman (b. 1908),
prominent Russian mineralogist, who first reported the existence
of a sodium phosphate in 1963.
MinRec 21:306 (1990), Dana 8:738 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE: