Crystallographic form of Corundum
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Minerals: Miller indices (hkl): (001), (101), (201), (102), (11-4) are key to unlocking the properties of Corundum, a mineral with formula Al2O3 that belongs to the Oxides class, specifically the Hematite Group. Its crystal system is Trigonal, and within this classification, it falls under the -3m Hexagonal Scalenohedral crystal class according to the Hermann-Mauguin notation. The unit cell dimensions are a = 4.75 angstroms, b = 4.75 angstroms, c = 12.97 angstroms with angles α = β = 90 degrees and γ = 120 degrees. This information is based on illustrations in the “Atlas der Krystallformen” by V. M. Goldschmidt (1913-1923) specifically focused on Corundum.
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