Information card for entry 9009612

Structure parameters

• Mineral name: Niocalite
• Formula: Ca7 F Nb O17 Si4
• Calculated formula: Ca7 F Nb O17 Si4
• Title of publication: Niocalite revised: Twinning and crystal structure Note: cuspidine structure
• Authors of publication: Mellini, M.
• Journal of publication: Tschermaks Mineralogische und Petrographische Mitteilungen
• Year of publication: 1982
• Journal volume: 30
• Pages of publication: 249 - 266
• a: 10.863 Å
• b: 10.431 Å
• c: 7.37 Å
• α: 90°
• β: 110.1°
• γ: 90°
• Cell volume: 784.246 ų
• Number of distinct elements: 5
• Space group number: 7
• Hermann-Mauguin space group symbol: P 1 a 1
• Hall space group symbol: P -2ya
• Has coordinates: Yes
• Has disorder: No
• Has Fobs: No