A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Stibnite with arsenolite and quartz from Gondemar, Portugal |
|---|---|
| Description | This specimen is almost all stibnite but if you look closely you will see small crystals of brown-yellow arsenolite and clear quartz in some places. Stibnite, Sb2S3 (antimony sulfide), is readily identified when having the appearance shown: fine crystal clusters and long curved crystals. The curving of the long bladed crystals is due to twinning where one twin plane bends the crystal one direction and another twin plane bends it in the other direction. This can occur numerous times down the length of one crystal. The specimen shown is 7 cm across. |
| Location | Portugal. Near Gondemar. |
| Photographer | Darla Sondrol. 2001-07-11. |
| Collection | University of North Dakota Mineralogy Collection #68. |
| Key words | stibnite, Portugal, arsenolite, quartz |
| Tech details | 854 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 1125 |
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