http://inspire.ec.europa.eu/codelist/CommodityCodeValue/cassiteriteGemstoneINSPIRE Registry teamJRC-INSPIRE-SUPPORT@ec.europa.euhttp://inspire.ec.europa.eu/registry2015-08-18 18:09 PM CEST2015-08-18 18:09 PM CESTcassiterite-gemstoneCassiterite is a mineral that has ornately faceted specimens with high luster. It is generally opaque, but its luster and multiple crystal faces cause a nice sparkle. - http://www.galleries.com/Cassiterite