Sturmanite
Ca6Fe3+2(SO4)2.5[B(OH)4](OH)12 • 25H2O [CNMNC approved formula]
Named for B. Darko Sturman (1937-), Canadian mineralogist, Royal Ontario Museum, Toronto, Canada.
| IMA status : | Approved Species 1983 () |
| CLASSIFICATION | |
| Dana (8th edition) : |
32.04.04.02 |
| (32) Compound Sulfates | |
| (32.04) (hydrous) with poly-anionic formula | |
| (32.04.04) Charlesite Group | |
| Nickel-Strunz (10th edition) : |
07.DG.15 |
| (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates) | |
| (07.D) Sulfates (selenates, etc.) with additional anions, with H2O | |
| (07.DG) With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3 | |
| Crystal system: | Tetragonal System |
| Point group (H-M): | 4mm — ditetragonal-pyramidal |
| Other Properties: | Gemstone Unlikely Available. |