Calcite El Potosi Mine, Santa Eulalia, Chihuahua, Mexico |
Calcite El Potosi Mine, Santa Eulalia, Chihuahua, Mexico (longwave UV) |
Fluorite, galena Rogerley Mine, Frosterley, County Durham, England |
Fluorite, galena Rogerley Mine, Frosterley, County Durham, England (longwave UV) |
Chalcedony Hidalgo County, New Mexico |
Chalcedony Hidalgo County, New Mexico (shortwave UV) |
"Terlingua like" calcite Mexico |
"Terlingua like" calcite Mexico (longwave UV) |