Gem green sanidine
This is a gem green sanidine crystal. Mineral ZoneTM obtained this specimen during the Denver 2013 shows. A surface coating of clay disguised its transparency; nevertheless the specimen appears in a Ste. Marie show report in the Mineralogical Record. Following the removal of the clay, professional photography shows its true quality. This is a world class feldspar crystal, from a classic locality but outstanding in its size, and also its curious green color.