Sedimentary mica flakes are produced having a bulk density of between about five and one-half pounds per cubic feet and eight pounds per cubic feet (5.5-11 lbs/ft3), a high aspect ratio, and a G.E. brightness between about seventy-five and ninety (75-90). Operations include applying shear forces to delaminate...http://www.google.es/patents/US6436523?utm_source=gb-gplus-sharePatente US6436523 - Delaminated sedimentary mica
