Pyrophyllite.
The physical properties of pyrophyllite and talc are practically identical. The main difference is that pyrophyllite has an abundance of aluminum in its chemical make-up and talc has an abundance of magnesium. Pyrophyllite occurs in metamorphic rocks rich in aluminum. It is used in insecticides and as an additive for glazing ceramic tiles. It is also a good material for use in the craft industry.

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." http://www.gov.nl.ca/mines&en/geosurvey/.