Information card for entry 9013811

Structure parameters

• Mineral name: Roumaite
• Formula: Ca3.19 Ce1.22 F3 H Na2.07 Nb0.55 O15 Si4 Ti0.45
• Calculated formula: Ca3.19 Ce1.22 F3 H Na2.07 Nb0.55 O15 Si4 Ti0.45
• Title of publication: Roumaite, (Ca,Na)3(Ca,REE,Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: A new mineral species related to dovyrenite
• Authors of publication: Biagioni, C.; Bonaccorsi, E.; Merlino, S.; Parodi, G. C.; Perchiazzi, N.; Chevrier, V.; Bersani, D.
• Journal of publication: The Canadian Mineralogist
• Year of publication: 2010
• Journal volume: 48
• Pages of publication: 17 - 28
• a: 7.473 Å
• b: 11.294 Å
• c: 18.778 Å
• α: 90°
• β: 101.6°
• γ: 90°
• Cell volume: 1552.49 ų
• Number of distinct elements: 9
• Space group number: 9
• Hermann-Mauguin space group symbol: C 1 c 1
• Hall space group symbol: C -2yc
• Has coordinates: Yes
• Has disorder: No
• Has Fobs: No