Since there has been a sudden uptick in people following my nonsense, here is my favorite #mineral specimen.
#Pyromorphite from the Wheatley Mines in #Pennsylvania circa ~1870s. Before being shut down, the Phoenixville District sourced much of the lead used in bullets for the American Civil War. I like the thought of Pennsylvania rocks breaking Confederate skulls.
Specimen mine. Photo Mark Mauthner. Ex. Wheatley Collection