Information card for entry 9000025

Structure parameters

• Mineral name: Biotite
• Formula: Al F H K Mg3 O11 Si3
• Calculated formula: Al F H K Mg3 O11 Si3
• Title of publication: Polymorphism of the micas with optical measurements
• Authors of publication: Hendricks, S. B.; Jefferson, M. E.
• Journal of publication: American Mineralogist
• Year of publication: 1939
• Journal volume: 24
• Pages of publication: 729 - 771
• a: 5.3 Å
• b: 5.3 Å
• c: 60 Å
• α: 90°
• β: 90°
• γ: 120°
• Cell volume: 1459.6 ų
• Number of distinct elements: 7
• Space group number: 2
• Hermann-Mauguin space group symbol: P -1
• Hall space group symbol: -P 1
• Has coordinates: Yes
• Has disorder: No
• Has Fobs: No