Arsenopyrite from Guadalix de la Sierra, Community of Madrid, Spain
Spain | |
| Geominero Museum of Madrid |
| Geominero Museum of Madrid Collection |
| Geominero Museum of Madrid Collection |
| Geominero Museum of Madrid Collection |
| Geominero Museum of Madrid Collection |
| Geominero Museum of Madrid |
San Isidro Mine, La Erilla, Guadalix de la Sierra, Community of Madrid, Spain