Talc is a mineral of low- to medium-grade metamorphic
rocks rich in magnesium. It is often derived from ultrabasic igneous rocks
made up of enstatite and olivine. It may be a major rock-forming mineral,
e.g., in soapstone or steatite. It has many consumer uses, the most familiar
of which is talcum powder. It has a low conductivity for heat and electricity,
is fire resistant, hardens when heated to a high temperature and is not
damaged by acids. It is used in ceramics, as a filler in paint, paper and
rubber, and as acid-proof table-tops and sinks.
Reproduced by permission of David Liverman, Government of Newfoundland and Labrador. From
Geological Survey of Newfoundland and Labrador
- "Minerals of Newfoundland and Labrador: Industrial Minerals."