| STEWARTITE | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
| Locality: Valencia Mine, N. Groton, NH | |
| Specimen Size: Stewartite crystals 0.1 to 0.2 mm | |
| Environment: Phosphate pegmatite | |
| Field collected: Tom Mortimer | |
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