Danburite rough and cut San Luis Potosi, Mexico |
Sphalerite on Quartz Shuikoushan Lead/Zinc Mine, Chaling, Hunan Province, China |
Wulfenite Wulfenite from Villa Ahumada, Sierra de Los Lamentos, Chihuahua, Mexico |
Olmiite on Calcite N Chwanning II Mine, Kuruman, Republic of South Africa |
Tourmaline var. Uvite with Magnesite and Quartz Brumado, Bahia, Northeast Region, Brazil |
Opal: Rough and Cut Shoa Province, Ethiopia |