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Andesine
NaAlSi3O8

     Andesine is relatively rare at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually grey or green.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is triclinic; P1.
Crystal Habits include phenocrysts.
Cleavage: {001} is perfect and {010} is good.
Fracture is conchoidal to uneven.
Hardness is 6 - 6.5
Specific Gravity is approximately 2.67 g/cm3.
Streak is white.
Associated Minerals include aegirine, calcite, epidydimite, fluorite,
   gonnardite, sÚrandite, ussingite, vuonnemite and yofortierite.
Distinguishing Features: Crystal habit.
Origin: Named in 1841 after its discovery locality in lavas in the
   Andes Mountains, Bolivia.

CLASSIFICATION:

Dana System
# 76.1.3.3

Strunz Classification
# VIII/J.2-7

REFERENCES:
Dana 8:1608 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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