Chabazite-Ca
Na₂₆REE₆(SiO₃)₆(PO₄)₆(CO₃)₆(S⁴⁺O₂)O

     Chabazite-Ca is a very rare accessory mineral at Mont Saint-Hilaire. Formerly known as chabazite, the species has been recently analyzed as Chabazite-Ca according to the latest recommendations for zeolites from the International Mineralogical Association.

PHYSICAL CHARACTERISTICS:

Color is usually colorless, white or tan.
Luster is vitreous to dull to pearly.
Diaphaneity is transparent to translucent to opaque.
Crystal System is triclinic; R3m.
Crystal Habits include rounded hexagonal plates, flakes, rosettes
   and spherical aggregates of flakes; six-pointed stellate crystals
   or groups.
Cleavage {101} is distinct.
Fracture is uneven.
Hardness is 4 - 5.
Specific Gravity is approximately 2.0 g/cm³.
Streak is white.
Associated Minerals include aegirine, albite, analcime,
   microcline and natrolite.
Distinguishing Features: crystal habit.
Origin: Named in 1792 from the Greek chabazios, tune or melody,
   one of twenty stones named in the poem Peri lithos, which
   extolled the virtues of minerals.

CLASSIFICATION:

REFERENCES:
MinRec 21:303 (1990), Dana 8:1652-1653 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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