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| PHARMACOSIDERITE | KFe3+4[(OH)4|(AsO4)3] · 6-7H2O |
| Locality: Pegmatite mine, N. Groton, NH | |
| Specimen Size: 4 mm fov. Cluster of cubic, olive-green, pharmacosiderite crystals. | |
| Environment: Phosphate pegmatite | |
| Field collected: Bob Wilken | |
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