Information card for entry 9006938

Structure parameters

• Mineral name: Akermanite
• Formula: Ca2 Mg O7 Si2
• Calculated formula: Ca2 Mg O7 Si2
• Title of publication: Determination of structures of Ca2CoSi2O7, Ca2MgSi2O7, and Ca2(Mg.55Fe.45)Si2O7 in incommensurate and normal phases and observation of diffuse streaks at high temperature Sample: T = 359.7 K Melilite group
• Authors of publication: Kusaka, K.; Hagiya, K.; Ohmasa, M.; Okano, Y.; Mukai, M.; Iishi, K.; Haga, N.
• Journal of publication: Physics and Chemistry of Minerals
• Year of publication: 2001
• Journal volume: 28
• Pages of publication: 150 - 166
• a: 7.8398 Å
• b: 7.8398 Å
• c: 5.0058 Å
• α: 90°
• β: 90°
• γ: 90°
• Cell volume: 307.669 ų
• Ambient diffraction temperature: 359.7 K
• 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