| Title | Ferrugninous chert |
| Description | This 15 cm wide sample of chert contains hematite and limonite, which give it the reddish color. |
| Photographer | Nessa Eull. 1899-12-30. |
| Collection | University of North Dakota Mineralogy Collection #3490. |
| Key words | chert |
| Tech details | 708 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 1516 |
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