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