Arrojadite-(KFe)
(KNa)Fe2+(CaNa2)Fe2+13Al(PO4)11(PO3OH)(OH)2 [CNMNC approved formula]
Named in 1925 and renamed 2006 after arrojadite and site occupancy of the arrojadite structure.
| IMA status : | Redefined IMA Approved; 2006 () |
| CLASSIFICATION | |
| Dana (8th edition) : |
41.07.02a.02 (This Dana# Added) |
| (41) Anhydrous Phosphates Containing Hydroxyl or Halogen | |
| (41.07) where (A B)m (XO4)4 Zq | |
| (41.07.02a) Arrojadite Group (Arrojadite Subgroup) (Al in Al site, OH in W site, Fe in M site) | |
| Nickel-Strunz (10th edition) : |
08.BF.05 |
| (08) Phosphates, Arsenates, Vanadates | |
| (08.B) Phosphates, etc. with Additional Anions, without H2O | |
| (08.BF) With medium-sized and large cations, (OH, etc.):RO4< 0.5:1 | |
| Crystal system: | Monoclinic System |
| Point group (H-M): | m — domatic |
| Unit cell: | a = 16.53Å, b = 10.05Å, c = 24.75Å β = 105.65° |
| Color: | Olive-green |
| Hardness (Mohs): | 5 |
| Measured Density: | 3.5 - 3.6 g/cm3 |
| Cleavage: | Distinct/Good On {100} good; on {010}, distinct. |