Le corindon (α-Al₂O₃) a une structure rhomboédrique (groupe d'espace ${\displaystyle \mathrm {R{\bar {3}}c} }$ n° 167, notation Strukturbericht D5₁), dont les paramètres de maille sont

• a = 5,128 Å ;
• α = 55,47 °.

Le motif est composé de deux groupements hexaédriques dont la hauteur fait 2,73 Å. Les plan de symétrie de ces hexaèdres sont séparés d'une distance de 7,21 Å.

The corundum (α-Al₂O₃) has a rhombohedral structure (space group ${\displaystyle \mathrm {R{\bar {3}}c} }$ nr. 167, Strukturbericht notation D5₁), which cell parameters are:

• a = 5.128 Å ;
• α = 55.47 °.

The motto is made of two hexaheral groups which height is 2.73 Å. The symetry planes of the groups are 7.21 Å away.

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Voir aussi/see also

• Image:Rhomboedrique D51.svg
• Image:Rhomboedrique D51 2.svg

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