A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Twinned gypsum |
|---|---|
| Description | Gypsum, CaSO4•2H2O, is a common evaporite mineral. Here we see two gypsum crystals twinned to form a swallowtail twin. Twins are two or more crystal domains that are intergrown and share common atoms. These crystals are about 5 cm in length. |
| Photographer | Darla Sondrol. 2001-06-05. |
| Collection | University of North Dakota Mineralogy Collection. |
| Key words | gypsum, twin |
| Tech details | 548 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 614 |
 | |