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Pirssonite crystals - 5mm© Gilles Haineault

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Pirssonite
Na2Ca(CO3)2 · 2H2O

     Pirssonite is another rare species from MSH.

PHYSICAL CHARACTERISTICS:

Color is usually colorless to yellow.
Luster is vitreous.
Diaphaneity is transparent.
Crystal System is orthorhombic; Fdd2.
Crystal Habits include prismatic crystals and diamond shaped
   cross-sections.
Cleavage none.
Fracture is conchoidal.
Hardness is 3 - 3.5
Specific Gravity is approximately 2.35 g/cm3.
Streak is white.
Associated Minerals include analcime, calcite, feldspar group,
   galena, halite and kogarkoite.
Distinguishing Features: Crystal habits.
Origin: Named in 1896 after Louis Valentine Pirsson (1860-1919),
   American professor of geology.

CLASSIFICATION:

Dana System
# 15.2.1.1

Strunz Classification
# V/D.02-50

REFERENCES:
Dana 8:465 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
¤¤

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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