Birnessite (delta MnO2-3H2O) in a large spherulite in obsidian near Silver Cliff, Colorado
Journal of Research of the U.S. Geological Survey
By: Fred A. Hildebrand
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Abstract
Birnessite and cryptomelane were identified in the montmorillonitic border zone of a large spherulite in obsidian north of Silver Cliff, Colo. The manganese minerals contain no silver and probably formed more recently than argentian cryptomelane which is abundant in the manganiferous silver ores of the surrounding volcanic rocks.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Birnessite (delta MnO2-3H2O) in a large spherulite in obsidian near Silver Cliff, Colorado |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 2 |
| Issue | 4 |
| Year Published | 1974 |
| Language | English |
| Publisher | U. S. Geological Survey |
| Description | 3 p. |
| First page | 467 |
| Last page | 469 |
| Country | United States |
| State | Colorado |
| County | Custer County |
| City | Silver Cliff |
| Other Geospatial | Silver Cliff Plateau |
| Google Analytic Metrics | Metrics page |