Copper
Penn Mine, Campo Seco, Campo Seco Mining District, Foothill Copper Belt, Calaveras County, California, USA
At a glance, the hexagonal shape of this specimen of dull botryoidal copper might cause it to be mistaken for a rounded example of the pseudomorphs after aragonite from Corocoro, Bolivia. A view of the back side (child photo), however, betrays the reality: this is a mold in which secondary copper precipitated and grew over the head of a hexagonal ...
© DSW 2018