Geminite
Cu2+(AsO3OH) • H2O [CNMNC approved formula]
Named from the Latin gemini, twins, in allusion to the usual character of the crystals.
| IMA status : | Approved Species 1990 () |
| CLASSIFICATION | |
| Dana (8th edition) : |
40.05.12.01 |
| (40) Hydrated Phosphates | |
| (40.05) with miscellaneous formulae | |
| (40.05.12) | |
| Nickel-Strunz (10th edition) : |
08.CB.30 |
| (08) Phosphates, Arsenates, Vanadates | |
| (08.C) Phosphates without Additional Anions, with H2O | |
| (08.CB) With only medium-sized cations, RO4:H2O = 1:1 | |
| Crystal system: | |
| Point group (H-M): | |