CaAlSi16 · 9H
There are only a few confirmed specimens of gismondine from Mont Saint-Hilaire.
PHYSICAL CHARACTERISTICS:
Color is usually colorless to very pale pink.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is monoclinic;
Crystal Habits include pseudo-octahedral to 1mm.
Cleavage {101} is distinct.
Fracture is conchoidal.
Hardness is 4.5
Specific Gravity is approximately 2.25 g/cm
Streak is white.
Associated Minerals include analcime.
Distinguishing Features: Crystal habit.
Origin: Named in 1817 after Carlo Giuseppe Gismondi (1762-1824),
who first examined the mineral.
CLASSIFICATION:
Dana System
# 77.1.3.1
Strunz Classification
# VIII/J.25-20
REFERENCES:
MinRec 21:312 (1990), Dana 8:1661-1662 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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