| Title | Mascagnite from Sonoma County, California, USA |
| Description | The whitish material is mascagnite, ammonium sulfate. It is a very rare mineral because it is highly soluble in water. It generally only occurs as short lived crusts and coatings. This specimen is 5 cm across. |
| Location | USA ▹ California ▹ Sonoma County |
| Photographer | Shannon Heinle. 2001-06-05. |
| Collection | University of North Dakota Mineralogy Collection #838. |
| Key words | mascagnite, California |
| Tech details | 450 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 593 |
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