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| Description | |
|---|---|
| Quality of samples: | not specified / average specimens |
| Confirmation | |
| Validity: | Believed Valid |
| References | |
| References: | Faber F.J., 1959, De Winterswijkse Muschelkalk. Geol. en Mijnb. 21: 25-31 |
| Data | |
| Mineral Data: | Click here to view Chalcedony data |
| Locality Data: | Click here to view Ratum Quarry, Vosseveld, Winterswijk, Gelderland, Netherlands |
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