| Title | Arsenopyrite in biotite schist |
| Description | This specimen (8 cm across) contains silvery arsenopyrite (FeAsS) in a fine grained biotite schist. Minor chlorite is also present but hard to pick out. Arsenopyrite is the most common ore of arsenic. Although in a schist here, it is more commonly found in high temperature veins. |
| Location | USA ▹ South Dakota. Near Leed. Homestake Mine. |
| Photographer | Darla Sondrol. 2001-07-11. |
| Collection | University of North Dakota Mineralogy Collection #230. |
| Key words | arsenopyrite, biotite Schist, South Dakota |
| Tech details | 807 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 1139 |
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