A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Snowflake obsidian, Millard, Utah |
|---|---|
| Description | This sample of black obsidian (volcanic glass) containing “snowflake” patches is from near Millard, Utah. Volcanic glass cools so quickly there is generally inusfficient time for mineral cyrstals to form. The snowflakes are places where the glass is partially crystallizing to form cristobalite, a polymorph of quartz. This specimen is 8 cm across. |
| Location | USA ▹ Utah ▹ Millard |
| Photographer | Mike Davis. 2001-04-26. |
| Collection | Ward’s University Rock Collection #106. |
| Key words | obsidian, Utah |
| Tech details | 468 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm AF Nikon micro lens. |
| GeoDIL number | 414 |
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