- Bornite, Silver
- Small Cabinet, 5.3 x 2.7 x 0.4 cm
- San Martin, Mun. de Sombrerete, Zacatecas, Mexico
A sheet of natural silver, from a thin seam the in host rock, with a coating of slightly iridescent bornite (the darker, blue-to-gray areas) - from the rich Zacatecas Silver District of Mexico.