A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Opal, cabachon |
|---|---|
| Description | Opal, SiO2-nH2O (hydrated silicon dioxide), is considered a mineraloid because this 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. |
| Photographer | Darla Sondrol. 2001-11-09. |
| Collection | Ward’s Natural Science, 49 E 6208. |
| Key words | opal |
| Tech details | 55 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 1791 |
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