Sursassite
Mn2+2Al3(SiO4)(Si2O7)(OH)3 [CNMNC approved formula]
Named from the Roman name for Oberhalbstein, Sursass, Switzerland.
| IMA status : | Valid species (Pre-IMA) Grandfathered |
| CLASSIFICATION | |
| Dana (8th edition) : |
58.02.03.01 |
| (58) Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups | |
| (58.02) with cations in [6] and higher coordination; single and double groups (n=1,2) | |
| (58.02.03) Sursassite and related species | |
| Nickel-Strunz (10th edition) : |
09.BG.15 |
| (09) Silicates | |
| (09.B) Sorosilicates (dimer) structures | |
| (09.BG) Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination | |
| Crystal system: | Monoclinic System |
| Point group (H-M): | 2/m — prismatic |