Calciohilairite
CaZrSi₃O₉ · 3H₂O

     Calciohilairite, the calcium analog of hilairite is relatively rare at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually white.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is hexagonal; R32.
Crystal Habits include blocky trigonal crystals.
Cleavage none.
Fracture is conchoidal.
Hardness is 4.
Specific Gravity is approximately 2.65 g/cm³.
Streak is white.
Associated Minerals include (??).
Distinguishing Features: Crystal habits.
Origin: Named in 1988 to reflect its composition: the calcium analog
   of hilairite.

CLASSIFICATION:

REFERENCES:
CanMin 32:843-854 (1994), Dana 8:1229-1230 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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