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| Rocks and Minerals |
| Shale |
| Hornfels |
| Diabase |
| Limonite |
| Greenstone |
| Rhyolite |
| Quartzite |
| Conglomerate |
| Limestone |
| Sandstone |
| Calcite |
| Quartz |
Limonite |
| Limonite is a mineral found at the base of the mountains in and around Frederick. It's easily identified by the rusty orange colors, indicative of iron. |
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