Gel 6 : A term used to designate highly colloidal, high-yielding, viscosity-building commercial clays, such as bentonite and attapulgrite clays. (Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}