Agate and onyx;Andalusite;Augite;Chamotte;Corundum;Cristobalite;Diatomite, kieselguhr/tripolite;Emery;Feldspar;Flint or chert;Garnet;Hornblende;Jasper;Mica, processed;Mica, raw;Olivine;Quartz;Rock crystal;Silica, natural;Sillimanite/fibrolite;Vermiculite;