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| GREIFENSTEINITE | Ca2(Fe2+, Mn)5Be4[(OH)4|(PO4)6] · 6H2O |
| Locality: Palermo #1 Mine, N. Groton, NH | |
| Specimen Size: 0.3 mm pale green pseudo-hexagonal crystal | |
| Environment: Phosphate pegmatite | |
| A purchased specimen | |
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