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Minor abrasives - corundum, emery, diatomite, pumice, volcanic ash and staurolite / Abrasifs doux - corindon, émeri, diatomite,
pierre ponce, cendre volcanique et staurolite; Andrews, P R A. Canada Centre for Mineral and Energy Technology, Summary Report
no. 15, 1991, 91 pages,
https://doi.org/10.4095/328636 
Open Access