Hydroxyhalide, atacamite group, forms a series with nickel-bearing paratacamite
Specific gravity: 3.76 calculated
Colour: Dark green
At the type locality, the 132 North Ni mine, Widgiemooltha, Coolgardie Shire, Western Australia, aggregates of gillardite crystals to 0.5 mm were found in a silicified ferruginous gossan with nickel-bearing clinoatacamite (AJM 13.1.15-17).
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