Wollastonite in eastern Ontario

CIM Bulletin, Vol. 82, No. 922, 1989

A. MacKinnon and P.W. Kingston, Ministry of Northern Development and Mines, Southeastern District, W.F. Caley, Technical University of Nova Scotia

Wollastonite (CaSiO3) is experiencing increased usage in a variety of applications, such as fillers in paints, plastics and resins, as an extender to replace both non-fibrous and fibrous materials (e.g. asbestos), and in the glass and ceramics industries. Significant new deposits of wollastonite have been discovered in Marmora Township, about 175 km northeast of Toronto. The geological setting of these large-tonnage, high-grade deposits has recently been investigated to assess the possibility of their development. A preliminary study of the chemistry, as well as the mineralogy of six occurrences is presented. Based upon this information, it is suggested that several of the deposits have an excellent development potential.
Keywords: Wollastonite, Metamorphism, Industrial minerals, Marmora Township, Grenville, Ceramics, Skarn, Platinova-Cominco