| Abstract: | Stoneham in northeastern Colorado is known throughout the world for its occurrence of stunning blue barite crystals. The barite at Stoneham occurs in a bed rich in montmorillonite clay, derived from alteration of volcanic ash, in the Chadron Formation of the White River Group of Oligocene sedimentary rocks. The barite crystals, as much as 4-6 inches long, crystallized from ground water within open pockets that formed by movement along a northeast-dipping reverse fault that cuts the clay bed. -from Authors |
| Genre: | Article |
| ProdID: | 70015923 |
| Citation Author: | Modreski, P. J.; Lees, B.; Wilson, D. |
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| Citation End Page: | 222 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Rocks & Minerals |
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| Citation Number Of Pages: | 20 |
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| Citation Search Results Text: | New explorations at the Stoneham, Colorado, barite locality; 1990; Article; Journal; Rocks & Minerals; Modreski, P. J.; Lees, B.; Wilson, D. |
| Citation Start Page: | 203 |
| Citation Volume: | 65 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | New explorations at the Stoneham, Colorado, barite locality; 1990; Article; Journal; Rocks & Minerals; Modreski, P. J.; Lees, B.; Wilson, D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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