A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Opal |
|---|---|
| Description | Opal, SiO2-nH2O (hydrated silicon dioxide), is considered a mineraloid because its structure is not truly crystalline. The chemistry of opal is primarily SiO2 and 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. The gem in this photo is courtesy of: The Jewel Box, Grand Forks, ND. |
| Photographer | Darla Sondrol. 2002-04-22. |
| Collection | The Jewel Box Collection of Gemstones. |
| Key words | opal, Jewel Box |
| Tech details | 38 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 2737 |
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