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| Description | |
|---|---|
| Quality of samples: | not specified / average specimens |
| Confirmation | |
| Validity: | Believed Valid |
| References | |
| References: | Mineral collecting in Pennsylvania, 1965 - Lapham & Geyer, pg. 130 |
| Data | |
| Mineral Data: | Click here to view Muscovite data |
| Locality Data: | Click here to view Grace Mine, Morgantown, Berks Co., Pennsylvania, USA |
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