Hibschite
Ca₃Al₂(SiO₄)_3-x(OH)_4x, (x=0.2 - 1.5)

     Hibschite is rare at Mont Saint-Hilaire. It is often cited as hydrogrossular.

PHYSICAL CHARACTERISTICS:

Color varies from pale green, grayish-white and yellow-brown.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is isometric; Ia3d.
Crystal Habits include octahedral crystals in stacked aggregates.
Cleavage is absent.
Fracture is conchoidal.
Hardness is 7.
Specific Gravity is approximately 3.2 g/cm³.
Streak is white.
Associated Minerals include götzenite, pectolite, tadzhikite and
   vesuvianite.
Distinguishing Features: Crystal habit.
Origin: Named in 1905 after Joseph Emanuel Hibsch, Teschen,
   Bohemia who found the original specimen.

CLASSIFICATION:

REFERENCES:
Dana 8:1051-1052 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

Legend