- Guanacoite, ArhBaryte
- El Guanaco Mine, Guanaco (Huanaco), Santa Catalina, Antofagasta Province, Antofagasta Region, Chile
- Thumbnail, 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 arhBaryte, another very rare arsenate.