Bournonite (“cogwheel”-esque twins) Amethyst but the rightmost Microcline along

but the rightmost Microcline along with the termination of the Smoky Quartz are both contacted

modified scalenohedra of Calcite sitting on underlain "chlorite" on matrix

Specimen # BOL711B16

Specimen # BOL711B04

with only a few minor sub-surface inclusions that keep it from being completely transparent

Bournonite (“cogwheel”-esque twins) Amethyst but the rightmost Microcline alongA hard to find "cogwheel" esque group of sharp, fairly thick, blocky modified twinned crystals of Bournonite with excellent luster and aesthetics. The piece would be classified as a large thumbnail small toenail and displays well from several angles (my favorite being the last picture). The stacked appearance of the crystals, combined with the bright metallic luster, makes this one of the more unique smaller Bournonites I have handled from this mine.