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Calcite (variety manganese-rich) on Quartz
Sheffler's Geode Mine, St. Francisville, Clark County, Missouri, USA
large geode about 18 cm. The calcites are up to about 4.5 cm
(Author: Bob Harman)
| Dimensions: | 1400 x 1224 |
| File size: | 461.69 kbytes |
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