A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Natroalunite, quartz and pyrite from near Silverton, Colorado, USA |
|---|---|
| Description | Gray natroalunite Na2Al6(SO4)4(OH)12, with hard to see quartz and pyrite from the National Belle Mine near Silverton, Colorado. Natroalunite is a secondary mineral often associated with kaolinite. It forms by interaction of sulfuric acid with feldspar, and is sometimes related to oxidation of pyrite or other sulfide minerals. |
| Location | USA ▹ Colorado. Near Silverton. National Belle Mine. |
| Photographer | Nessa Eull. 2001-06-06. |
| Collection | University of North Dakota Mineralogy Collection #808. |
| Key words | natroalunite, quartz, pyrite, Colorado |
| Tech details | 768 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 647 |
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