http://inspire.ec.europa.eu/codelist/CommodityCodeValue/smokeyQuartzINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 18:09 PM CEST2015-08-18 18:09 PM CESTsmokey quartzSmoky quartz is a brown to black variety of quartz - http://en.wikipedia.org/wiki/Smoky_quartz