A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Orpiment with arsenic |
|---|---|
| Description | Orpiment, As2S3 (arsenic sulfide), is a rare mineral that usually forms with realgar. In fact, the two minerals are almost always together. Crystals of orpiment are extremely rare as it usually forms masses and crusts. The masses are sometimes transparent to a degree and have a gemmy quality to them. The yellow color is special to orpiment and can be confused only with a few other minerals. Over time, orpiment will deteriorate into a powder. The process takes a long time, but exposure to light will accelerate it. |
| Location | USA ▹ Utah ▹ Toele County. Mercure Mine. |
| Photographer | Nessa Eull. 2001-07-17. |
| Collection | University of North Dakota Mineralogy Collection #86. |
| Key words | orpiment, arsenic, Utah |
| Tech details | 702 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 1232 |
 | |