Guildite
CuFe3+(SO4)2(OH) • 4H2O [CNMNC approved formula]
Named for Frank Nelson Guild (1870-1939), American mineralogist and economic geologist, University of Arizona, Tucson, Arizona, USA.
| IMA status : | Valid species (Pre-IMA 1928) Grandfathered |
| CLASSIFICATION | |
| Dana (8th edition) : |
31.09.07.01 |
| (31) Hydrated Sulfates Containing Hydroxyl or Halogen | |
| (31.09) where (A+ B++) (XO4) Zq · x(H2O) | |
| (31.09.07) | |
| Nickel-Strunz (10th edition) : |
07.DC.30 |
| (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates) | |
| (07.D) Sulfates (selenates, etc.) with additional anions, with H2O | |
| (07.DC) With only medium-sized cations; chains of edge-sharing octahedra | |
| Crystal system: | Monoclinic System |
| Point group (H-M): | 2/m — prismatic |