2.3 x 2.1 x 1.6 cm. Guanacoite is a very rare secondary copper, magnesium arsenate found in only two localities, worldwide. It was only described in 2003. This specimen is from the Type Locality - the El Guanaco Mine of Chile and features sky-blue guanacoite needles to 2 mm scattered on powder-blue globules of arhbarite, another very rare arsenate.
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