Information card for entry 9015624

Structure parameters

• Mineral name: Alunite
• Formula: Al2.916 H6.117 K0.876 Na0.071 O14.039 S2
• Calculated formula: Al8.748 H18.351 K2.628 Na0.213 O42.117 S6
• Title of publication: Thermal expansion of alunite up to dehydroxylation and collapse of the crystal structure Note: T = 200 C
• Authors of publication: Zema, M.; Callegari, A. M.; Tarantino, S. C.; Gasparini, E.; Ghigna, P.
• Journal of publication: Mineralogical Magazine
• Year of publication: 2012
• Journal volume: 76
• Pages of publication: 613 - 623
• a: 6.9806 Å
• b: 6.9806 Å
• c: 17.425 Å
• α: 90°
• β: 90°
• γ: 120°
• Cell volume: 735.341 ų
• Number of distinct elements: 6
• Space group number: 166
• Hermann-Mauguin space group symbol: R -3 m :H
• Hall space group symbol: -R 3 2"
• Has coordinates: Yes
• Has disorder: No
• Has Fobs: No