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"Cogswheel Twin"; Ex. Robert Brandenberger, Phil Scalisi
Nice miniature "cogswheel" twin of bournonite with a secondary partial twin. The bournonite has very good luster on most faces; one side is covered with a secondary growth of sulphides. Ex. Robert Brandenberger, Phil Scalisi. 3.5 x 2.0 x 1.7 cm.
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