- Calcite, Chalcopyrite
- Brushy Creek Mine, Greeley, Viburnum Trend District, Reynolds Co., Missouri, USA
- Cabinet, 12.5 x 9.5 x 5.0 cm
A fine, very sculptural cabinet calcite specimen from the Brushy Creek Mine of Missouri. This striking piece is dominated by a 7.3 cm, lustrous, translucent, doubly terminated and twinned calcite crystal. The very fine jumble of smaller calcite scalenohedrons is preferentially coated with sparkly, iridescent, multi-hued chalcopyrite microcrystals. These specimens have very interesting development: the original scalenohedrons were all covered with chalcopyrite, and then the calcite began growing again, enveloping the original crystal in some areas and leaving the chalcopyrite exposed in others. This is an impressive, large example of the classic combination species and well-known locality.