XL 7
This is a piece of solid Calcite with a coating of Hydrozincite from the Glove Mine, Santa Rita Mtns, Arizona.  Under shortwave UV the Calcite glows a fairly bright orange and the Hydrozincite a moderate blue.  Dimensions are 10 x 5 1/2 x 4 inches.  Weight is 14 lbs.  Price: $80.