Marianoite
Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 [CNMNC approved formula]
Named for Anthony ("Tony") Nicola Mariano (b. 1930) in recognition for his contributions to the study of alkaline rocks and carbonatites.
| IMA status : | Approved Species 2005 () |
| CLASSIFICATION | |
| Dana (8th edition) : |
56.02.04.18 (This Dana# Added) |
| (56) Sorosilicate Si2O7 Groups and O, OH, F. and H2O | |
| (56.02) with cations in [4] and/or >[4] coordination | |
| (56.02.04) Cuspidine - Wohlerite group | |
| Nickel-Strunz (10th edition) : |
09.BE.17 |
| (09) Silicates | |
| (09.B) Sorosilicates (dimer) structures | |
| (09.BE) Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination | |
| Crystal system: | Monoclinic System |
| Point group (H-M): | 2/m — prismatic |