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, sérandite, ussingite, vuonnemite and yofortierite.
Distinguishing Features: Crystal habit.
Origin: Named in 1841 after its discovery locality in lavas in the
Andes Mountains, Bolivia.

CLASSIFICATION:

REFERENCES:
Dana 8:1608 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH          PE          AP          MX          SS           MC          HF           BR          SX          FR
¤¤¤            —             —             —             —               —             —               —             —             —  

Legend