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Ussingite crystals - click for larger pic
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Home > Mineral Descriptions > Ussingite - (3 Photos)



Ussingite
Na2(AlSi3O8)(OH)

     Ussingite is rare mineral at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually colorless to pale pink.
Luster is vitreous to greasy.
Diaphaneity is transparent.
Crystal System is triclinic; P1.
Crystal Habits include stacked tabular crystals to 2mm, and massive
   ussingite forming spherical pods.
Cleavage {110} is perfect.
Fracture is (??).
Hardness is 6.5
Specific Gravity is approximately 2.5 g/cm3.
Streak is white.
Associated Minerals include aegirine, albite, eudialyte, griceite,
   lovozerite, lueshite, natrophosphate, pectolite, sodalite, sphalerite,
   thalcusite and thermonatrite.
Distinguishing Features: crystal habit and forms.
Origin: Named in 1915 after Niels Viggo Ussing (1864-1911),
   Danish professor of mineralogy.

CLASSIFICATION:

Dana System
# 76.3.3.1

Strunz Classification
# VIII/J.14-10

REFERENCES:
MinRec 21:343-344 (1990), Dana 8:1644-1645 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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