Information card for entry 9007421

Structure parameters

• Mineral name: Topaz
• Formula: Al2 F2 O4 Si
• Calculated formula: Al2 F2 O4 Si
• Title of publication: Elastic behaviour and structural evolution of topaz at high pressure Locality: Ouro Preto, Minas Gerias, Brazil Sample: P = 3.14 GPa
• Authors of publication: Gatta, G. D.; Nestola, F.; Ballaran, T. B.
• Journal of publication: Physics and Chemistry of Minerals
• Year of publication: 2006
• Journal volume: 33
• Pages of publication: 235 - 242
• a: 4.6325 Å
• b: 8.7938 Å
• c: 8.3254 Å
• α: 90°
• β: 90°
• γ: 90°
• Cell volume: 339.154 ų
• Ambient diffracton pressure: 3140000 kPa
• Number of distinct elements: 4
• Space group number: 62
• Hermann-Mauguin space group symbol: P b n m
• Hall space group symbol: -P 2c 2ab
• Has coordinates: Yes
• Has disorder: No
• Has Fobs: No