In silicate and carbonate cavities and in nepheline syenite pegmatites.
IMA Status:
Approved IMA 1997
Locality:
Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, as well as in the Corporation quarry, Montreal, Quebec, Canada. Link to MinDat.org Location Data.
Name Origin:
Named after Steve Cares (1909-) and Janet Cares (1921-) of Sudbury, MA, Canada, who found the mineral.