A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Gypsum crystal with swallowtail twin |
|---|---|
| Description | Gypsum crystals often interpentrate to form what is called a “swallowtail twin.” The vertical crystal shown here is actually composed of two different crystal domains that share common atoms. The top surface has a reentrant angle because of the two different domains. This specimen is 9 cm tall. |
| Photographer | Darla Sondrol. 2001-06-05. |
| Collection | University of North Dakota Mineralogy Collection #790. |
| Key words | gypsum, twin |
| Tech details | 334 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 613 |
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