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| METAVIVIANITE | Fe2+3-xFe3+x(PO4)2(OH)x·(8-x)H2O |
| Locality: Valencia Mine, N. Groton, NH | |
| Specimen Size: Rhombic tabular, pale-green, Metavivianite crystals, largest 0.2 mm | |
| Environment: Phosphate pegmatite | |
| Field collected: Tom Mortimer | |
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