A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Aragonite from Tasna, Bolivia |
|---|---|
| Description | The dark gray mineral is aragonite. Aragonite is an orthorhombic mineral, but twinning often leads to an apparent hexagonal-prismatic shape, as in this sample. Aragonite is a polymorph of calcite, meaning it has the same composition but different structure and crystal shape. At the Earth surface, aragonite is thermodynamically less stable than the more common calcite, but it often forms by some disequilibrium processes. This specimen is 4 cm across. |
| Location | Bolivia. Near Tasna. |
| Photographer | Darla Sondrol. 2001-06-12. |
| Collection | University of North Dakota Mineralogy Collection #662. |
| Key words | aragonite, Bolivia |
| Tech details | 586 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 716 |
 | |