Vivianite
Fe2+3(PO4)2 • 8H2O [CNMNC approved formula]
Named after the English mineralogist, J. G. Vivian.
| IMA status : | Valid species (Pre-IMA 1817) Grandfathered |
| CLASSIFICATION | |
| Dana (8th edition) : |
40.03.06.01 |
| (40) Hydrated Phosphates | |
| (40.03) where (A++)3 (XO4)2 · x(H2O) | |
| (40.03.06) Vivianite Group | |
| Nickel-Strunz (10th edition) : |
08.CE.40 |
| (08) Phosphates, Arsenates, Vanadates | |
| (08.C) Phosphates without Additional Anions, with H2O | |
| (08.CE) With only medium-sized cations, RO4:H2O about 1:2.5 | |
| Crystal system: | Monoclinic System |
| Point group (H-M): | 2/m — prismatic |
| Other Properties: | Gemstone Rare. BioMineral. |