Pyrite, Dolomite
Irene Quarry, Irene, Boone County, Illinois, USA
Two groups of pyrite crystals oriented on and enclosing marcasite whiskers, resting on minute dolomite rhombs. A later generation of pyrite deposition formed a rim, brilliantly lustrous, along the edges of the pyrite crystals. Personally collected late 1980s. Photo by Dan Behnke, 1987, posted with his permission.
© 2017 E. Clopton