A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Alunite |
|---|---|
| Description | Alunite (here gray and reddish brown), also called alumstone, is a source of the alum, which has a number of uses, especially in medicine. Alunite, KAl3(SO4)2(OH)6, forms when K-rich feldspars are altered by sulfuric acid in a process called “alunitization”. This sample about 9.5 cm in length. |
| Location | Japan |
| Photographer | Nessa Eull. 2001-06-06. |
| Collection | University of North Dakota Mineralogy Collection #807. |
| Key words | alunite, Japan |
| Tech details | 666 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 642 |
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