Formula: Na,Ca,☐)8(Al6Si6)O24 (CO3,SO4)2.2H2O
Tectosilicate (framework silicate), cancrinite group, feldspathoid
Crystal System: Hexagonal
Specific gravity: 2.42 to 2.51 measured, 2.49 calculated
Hardness: 5 to 6
Colour: Grey-green, white, yellow, blue, orange, reddish
Solubility: It is unusual among the silicate minerals in that it is moderately soluble in hydrochloric acid due to the carbonate ions in its structure.
Common impurities: Ti,Fe,Mg,K,Cl,S
Plutonic igneous environments
Cancrinite is a primary mineral in some
alkaline igneous rocks, including
in nepheline syenite. It is also an alteration product of
nepheline in igneous rocks (HOM). Associated minerals include
orthoclase, zircon and
At Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, cancrinite pseudomorphs after natrolite have been found with rhodochrosite (KL p265).
The type locality is the Ilmen Nature Reserve, Chelyabinsk Oblast, Russia.
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