(rottenstone) Soft decomposed rock that may contain crystalline (quartz) or amorphous forms of silica
US Department of Labor, Silica eTool - Glossary, Occupational Safety & Health Administration OSHA, Washington, D.C., USA 2010. https://www.osha.gov/dsg/etools/silica/glossary/gl ossary.html, (OSHA/ Silica - Amer) {625}