Copper Stope, Majuba Hill Mine, Pershing County, Nevada, USA
The specimen displays a number of copper minerals with colors ranging from pale blue to shades of green to deep turquoise blue. The latter color is from clinoclase, which also has the best crystals and dominates the specimen. The specimen does not have much sparkle, except under a loupe which reveals nearly black prismatic crystals in the middle of each tiny patch of pretty greenish-blue clinoclase. These crystals are tiny and appear black except when the light hits one just right, and then it becomes obvious that these are transparent crystals of clinoclase.