CUPRITE (var.) Chalcotrichite Smith Avenue (Baltimore City Line) near Bare Hills Copper Mine (Baltimore City / Baltimore County Line ), Jake Slagle Collection, Jake Slagle photographer

CUMMINGTONITE Bare Hills Copper Mine (Baltimore City / Baltimore County Line ), Jake Slagle Collection, Jake Slagle photographer

MAGNETITE XLS. Bare Hills Copper Mine (Baltimore City-County Line), Joseph F. Schreiber collection, Jake Slagle photographer

MAGNETITE in STEATITE Bare Hills Copper Mine (Baltimore City / Baltimore County Line ), Jake Slagle Collection, Jake Slagle photographer

IRIDESCENT CHALCOPYRITE Bare Hills Copper Mine (Baltimore City / Baltimore County Line ), Harvard Mineralogical Museum Collection, Jake Slagle photographer