Mica 6 : Any of a group of mineral silicates crystallizing naturally into a very thin, laminar sheets. When pulverized and sized, it is useful in combating lost circulation. (Bul 10C)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}