USGS Arsenic
Studies Group 
Arsenic Bearing Minerals
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USGS Arsenic
Studies Group
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|| Arsenic | Realgar | Orpiment | Arsenopyrite | Löllingite | Enargite ||
| Arsenic |  |
| Chemistry | As, Elemental Arsenic |
| Color | tin-white which quickly tarnishes to dark gray or black |
| Hardness | 3 - 4 |
| Specific Gravity | 5.6 - 5.7 |
| Crystal System | hexagonal |
| Realgar |   |
| Chemistry | AsS, Arsenic Sulfide |
| Color | orange-red |
| Hardness | 1.5-2 |
| Specific Gravity | 3.48 |
| Crystal System | monoclinic |
| Orpiment |
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| Chemistry | As2S3, Arsenic Sulfide |
| Color | lemon-yellow, orange, orange-brownish |
| Hardness | 1.5-2 |
| Specific Gravity | 3.49 |
| Crystal System | monoclinic |
| Environment | a sublimation product in fumaroles, and a byproduct of the decay of realgar. |
| Arsenopyrite | 
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| Chemistry | FeAsS, Iron Arsenic Sulfide |
| Color | Silverish, whiteish-grey, metallic |
| Hardness | 5.5-6 |
| Specific Gravity | 6.07 |
| Crystal System | monoclinic |
| Environment | in sulfide ore deposits, common in medium to high temperature hydrothermal veins. Frequently in metamorphic deposits |
| Löllingite |  |
| Chemistry | FeAs2, Iron Arsenide |
| Color | silver white to gray |
| Hardness | 5 - 5.5 |
| Specific Gravity | 7.1 - 7.5 |
| Crystal System | Orthorhombic |
| Enargite |  |
| Chemistry | Cu3AsS4, Copper Arsenic Sulfide |
| Color | gray to black |
| Hardness | 3 - 3.5 |
| Specific Gravity | 4.4+ |
| Crystal System | orthorhombic |
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URL: http://wwwbrr.cr.usgs.gov/usgs/Arsenic/minerals.htm Created/Maintained: R. Blaine McCleskey; rbmccles@usgs.gov Last Updated: 04/04/2008 |
