Grischunite
NaCa2Mn2+4(Mn2+,Fe3+)2(AsO4)6 • 2H2O [CNMNC approved formula]
Named from the former Romansch name Grischun for Graubunden Canton.
IMA status : | Approved Species 1984 () |
CLASSIFICATION | |
Dana (8th edition) : |
40.02.11.01 |
(40) Hydrated Phosphates | |
(40.02) where A++ (B++)2 (XO4) · x(H2O) | |
(40.02.11) | |
Nickel-Strunz (10th edition) : |
08.CF.05 |
(08) Phosphates, Arsenates, Vanadates | |
(08.C) Phosphates without Additional Anions, with H2O | |
(08.CF) With large and medium-sized cations, RO4:H2O > 1:1 | |
Crystal system: | Orthorhombic System |
Point group (H-M): | mmm (or 2/m 2/m 2/m) — dipyramidal |