| BYSSOLITE, Keystone Trappe Rock Quarry, Cornog, Chester County, Pennsylvania, 4 x 2.5 x 2.5 cm | |
 | Here is an example of Byssolite which occurs are fibrous needle like crystals. More commonly seen around the Epidotes in Pakistan, here is a specimen from Pennsylvania. York Calcites and Wheatley Pyromorphites and French Creek Chalcopyrites are well know Pennsylvanian minerals but other locations and minerals from Pennsylvanian are not too frequently seen shows. |
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