A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Opal (precious) |
|---|---|
| Description | Opal has been a popular gem for many centuries and has a very interesting structure. Opal is considered a mineraloid because this structure is not truly crystalline. The chemistry of Opal is primarily SiO2 with varying amounts of water from 5%-10% and greater. This water can help geologists determine the temperature of the host rock at the time the opal formed. |
| Location | Mexico. Near Durango. |
| Photographer | Darla Sondrol. 2002-03-22. |
| Collection | Ward’s Classroom Collection of Gem Minerals #10. |
| Key words | opal, Mexico |
| Tech details | 222 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 2525 |
 | |