Volborthite, a hydrous copper vanadate Cu3V2O7(OH)2·2H2O, on matrix containing malachite and sometimes chrysocolla. From the Copper Hill deposit, Picuris district, Taos Co., New Mexico.
Miniature specimen - About 1.4" x 1.4" x 0.5" (35mm x 35mm x 12mm)
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