... cost material to substitute titanium dioxide and rutile etc, sepiolite, white clay, pyrophyllite etc siliceous nonmetallic minerals are ... .03%<0.03%Sericite Mica Applied Function and FeaturesCompared with sepiolite, white clay, pyrophyllite, sericite mcia contains more K2O ... Lower water absorption and expansion rate ( pyrophyllite, 70.5%; sepiolite, 5.2%; Titanium dioxide, 32.6%; sericite mica, ...