Boulder 19
From the ghost town of Duquesne, in the Patagonia Mountains, Arizona, a combination of blue Diopside with red Calcite.  An interesting feature is the numerous small crystals of Diopside that glow a little brighter than the rest, providing an extra element of dimension.  Shown under shortwave UV.  Moderate brightness.  Dimensions are 3 x 2 x 1/2 inches.  Price: $25