This is an unusual thumbnail size specimen. A grouping of copper crystals up to 0.5 cm sitting on a sheet of copper. The specimen is from the Central Mine, Keweenaw County, Michigan.
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|Dimensions||3.0 × 1.8 × 0.5 cm|
Undamaged grouping of tan colored calcite crystals projecting prominently from a matrix which is covered with a first generation of smaller white calcite crystals. The top crystal is twinned. An unusual locality for me in that it comes from Gralex Quarry, Mont-sur-Marchienne, Charleroi, Hainaut Province, Belgium.