Calcite from this locale is know for fluorescing different colors when exposed to different wavelengths of ultraviolet light. This one has a vug lined with calcite. Within the calcite are druzy crystals of quartz. From left to right, SW, LW, MW, daylight and phosphorescence. Calcite fluoresces [in same order] blue, yellow, green. ISO-100 f/11 2 seconds exposure for UV pictures. There is a blue white calcite phosphorescence when the SW and MW lamps are removed. 12 ounces 4 1/2 x 3 x 1 1/4 inches.