A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Obsidian from Lake County, Oregon |
|---|---|
| Description | Obsidian, volcanic glass, generally has a jet black color, but this sample is brown due to the presence of oxidized iron. Obsidian forms when magma cools so quickly that mineral crystals cannot form. This sample is 8 cm across. |
| Location | USA ▹ Oregon ▹ Lake |
| Photographer | Mike Davis. 2001-04-26. |
| Collection | Ward’s University Rock Collection #105. |
| Key words | obsidian, Oregon |
| Tech details | 364 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm AF Nikon micro lens. |
| GeoDIL number | 413 |
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