Information card for entry 9001033

Structure parameters

• Mineral name: Omphacite
• Formula: Al0.758 Ca0.286 Fe0.082 Mg0.205 Na0.602 O6 Si2
• Calculated formula: Al0.758 Ca0.286 Fe0.082 Mg0.205 Na0.602 O6 Si2
• Title of publication: Crystal-chemical aspects of nonstoichiometric pyroxenes Sample: Vacancy model I
• Authors of publication: McCormick, T. C.
• Journal of publication: American Mineralogist
• Year of publication: 1986
• Journal volume: 71
• Pages of publication: 1434 - 1440
• a: 9.501 Å
• b: 8.654 Å
• c: 5.238 Å
• α: 90°
• β: 107.23°
• γ: 90°
• Cell volume: 411.35 ų
• Number of distinct elements: 7
• Space group number: 15
• Hermann-Mauguin space group symbol: C 1 2/c 1
• Hall space group symbol: -C 2yc
• Has coordinates: Yes
• Has disorder: No
• Has Fobs: No