Clinoclase, Chalcophyllite

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On a weathered limonite matrix are a few drusy clusters of sparkling, deep teal blue clinoclase, to .2 cm across, a copper arsenate. Associated with the clinoclase are tabular, green crystals of chacophyllite, to .4 cm across, a copper aluminum arsenate. From the collection of James E. Moresby White. Ex. Carnegie Museum Collection.