Information card for entry 9006448

Structure parameters

• Mineral name: Akermanite
• Formula: Ca2 Mg O7 Si2
• Calculated formula: Ca2 Mg O7 Si2
• Title of publication: Structural change associated with the incommensurate-normal phase transition in akermanite, Ca2MgSi2O7, at high pressure Sample: P = 0.0 GPa
• Authors of publication: Yang, H.; Hazen, R. M.; Downs, R. T.; Finger, L. W.
• Journal of publication: Physics and Chemistry of Minerals
• Year of publication: 1997
• Journal volume: 24
• Pages of publication: 510 - 519
• a: 7.8338 Å
• b: 7.8338 Å
• c: 5.0082 Å
• α: 90°
• β: 90°
• γ: 90°
• Cell volume: 307.345 ų
• Ambient diffracton pressure: 0 kPa
• Number of distinct elements: 4
• Space group number: 113
• Hermann-Mauguin space group symbol: P -4 21 m
• Hall space group symbol: P -4 2ab
• Has coordinates: Yes
• Has disorder: No
• Has Fobs: No