Go to the Data Sheet at the Plainsman Clays website
http://plainsmanclays.com/data/ALTA.HTMGo to the information page at the Digitalfire Reference Library
http://digitalfire.com/4sight/education/alberta_slip_20_years_of_substitution_for_albany_slip_251.htmlAlberta Slip is a product of Plainsman Clays and is mined in North America's premier "Clay Country" (near Ravenscrag, Saskatchewan, Canada and also in Montana, USA)