A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Dendrites of pyrolusite in moss agate from Montana |
|---|---|
| Description | This is a polished slab of rock showing pyrolusite (MnO2) dendrites (the black “branching” or tree like deposit) in chalcedony (a microcrystalline variety of quartz, SiO2). The name “moss agate” is given to translucent chalcedony with dendritic inclusion of manganese or iron oxides. |
| Location | USA ▹ Montana |
| Photographer | Shannon Heinle. 2001-02-09. |
| Collection | University of North Dakota Mineralogy Collection. |
| Key words | moss agate, pyrolusite, dendrite, chalcedony, Montana |
| Tech details | 963 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 41 |
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