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Cancrinite crystals - click for larger pic
Cancrinite crystals
Photo by Doug Merson
© Doug Merson

Cancrinite crystals - click for larger pic
Cancrinite crystals
Photo by Doug Merson
© Doug Merson

Cancrinite crystals - click for larger pic
Cancrinite crystals
Photo by Doug Merson
© Doug Merson

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Home > Mineral Descriptions > Cancrinite - (6 Photos)



Cancrinite
Na6Ca2(Al6Si6O24)(CO3)2 · 2H2O

     Cancrinite is relatively common at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually colorless to pale violet on smaller crystals, pale
   to dark violet on larger crystals, and pale to dark yellow and
   pale orange on fibrous masses.
Luster is vitreous on smaller crystals, dull to greasy on larger
   crystals and dull on fibrous masses.
Diaphaneity is transparent in smaller crystals, and opaque in larger
   crystals and fibrous masses.
Crystal System is hexagonal; P63.
Crystal Habits include fibrous columnar masses several centimeters
   across; crude prisms to 2cm; sharp prismatic crystals to 20mm
   showing two sets of hexagonal sets terminated by hexagonal pyramid
   and embedded spherical nodules of radiating prisms to 5mm.
Cleavage {010} is perfect and {001} is poor.
Fracture is uneven.
Hardness is 5 - 6.
Specific Gravity is approximately 2.25 g/cm3.
Streak is white.
Associated Minerals include amphibole group, biotite, fluorite,
   phlogopite, rinkite and sérandite.
Distinguishing Features: Crystal habit and color.
Origin: Named in 1839 for Count Georg Cancrin (Egor Frantsevich
   Kankrin)(1774-1845), Russian Minister of Finance.

CLASSIFICATION:

Dana System
# 76.2.5.3

Strunz Classification
# VIII/J.9-10

REFERENCES:
MinRec 21:301 (1990), Dana 8: 1634-1635 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
¤¤

MC
--

HF
--

BR
--

SX
¤¤

FR
¤¤

Legend

Cancrinite crystals - click for larger pic
Cancrinite
Photo by Modris Baum
© Modris Baum

Cancrinite crystal - click for larger pic
Cancrinite crystal
Photo by R. Lavinsky
© www.irocks.com

Cancrinite crystals - click for larger pic
Cancrinite
Photo by Gilles Haineault
© Gilles Haineault