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Cancrisilite
Na7Al5Si7O24(CO3)2 · 3 H2O

     Cancrisilite was revealed by recent investigations by Dr. Igor Pekov of Moscow State University in material from sodalite xenoliths from MSH. It is a member of the cancrinite group. It has been identified from material as early as 1984 and up to 1991.

     This species was collected at mont Saint-Hilaire before it was described as a new species.

PHYSICAL CHARACTERISTICS:

Color is usually colorless to pale lilac.
Luster is vitreous on smaller crystals and dull on fibrous masses.
Diaphaneity is transparent in smaller crystals and opaque for
    fibrous masses.
Crystal System is hexagonal; P63.
Crystal Habits include aggregates of prismatic hexagonal crystals
   of fibrous-columnar appearance to 1cm, individual crystals from
   1 to 2 mm in length.
Cleavage none observed.
Fracture is conchoidal.
Hardness is 5.
Specific Gravity is approximately 2.4 g/cm3.
Streak is white.
Associated Minerals include aegirine, eudialytes, lovozerites,
   molybdenite, pectolite, sphalerite, steenstrupine, thermonatrite
   and villiaumite.
Distinguishing Features: brittle.
Origin: Named in 1991 for its relation with cancrinite and its composition
   of silicon. It was formerly named carbonate vishnevite and designated
   as IMA 1990-013.

CLASSIFICATION:

Dana System
# 76.2.5.4

Strunz Classification
# VIII/J.9-10

REFERENCES:
ZVMO 120:80-84 (1991)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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