Silver, Bornite
San Martin Mine, San Martin, Mun. de Sombrerete, Zacatecas, Mexico
Miniature, 4.6 x 3.2 x 3.1 cm
A sheet of natural silver still embedded in a matrix of irisdescent bornite -- exposed at one end of the specimen (that is the silver sheet sticking up at the back side of the photo), and you can see the thin line running around the entire edge of the bornite which marks where the silver vein runs through it, completely dissecting it. Cool! 4.6 x 3.2 x 3.1cm