This is a plate of tightly massed acicular crystals of pretty blue-green brochantite from New Mexico, out of the collection of Carl Davis. Through a loupe, you can see that the crystals are actually gemmy little needles. Ask any collector who has been the Bingham - it is VERY difficult to find a specimen of brochantite this rich!
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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