Corundum - angew. Mineralogie

Corundum
IV - Oxides

`Name`		`Corundum`
`Chemistry`		`Al₂O₃`
`Hardness`		`9`
`Lustre`		`adamantine`
`Colour`		`in all colours, often bluish, reddish, colourless`
`Streak`		`white`
`Density [g/cm³]`		`3.9 - 4.1`
`Crystal habit`		`trigonal, crystals barrel shaped, twins [1011]`
`Cleavage, Fracture`		`fracture conchoidal`
`other characteristics and occurrences`		`in pegmatites and schists, placer deposits` `ruby = red` `sapphire = blue and other colours`

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