Talc An Introduction to the Rock-Forming Minerals, second edition, by W.A. Deer, R.A. Howie, and J. Zussman, 1992, Prentice Hall, ISBN 0-582-30094-0. http://rruff.geo.arizona.edu/doclib/hom/talc.pdf Handbook of Mineralogy http://www.mindat.org/min-3875.html Mindat.org http://webmineral.com/data/Talc.shtml Webmineral data