Some sapphire crystalsĪre color zoned concentrically and/or along the C axis. (all other colors): blue, pink, green, yellow, violet, purple, orange, brown, white, gray,īlack and colorless.

Blue sapphire: violet blue/blue-green, green sapphire: strong green/yellow-green, orange sapphire: yellow-brown to orange/colorless, purple sapphire: violet/orange, yellow sapphire: yellow/pale yellow and ruby: purple-red/orange-red

Corundum Twinning: commonly with multiple lamellar twinning on rhombohedral planes, less commonly with simple contact twins.

Prismatic faces often have deep horizontal striations.Īlso massive and coarse to fine granular. Striations meeting at 120 degrees forming successive equilateral triangles. Hexagonal pyramids with a barrel-shaped form. Pyramidal and rhombohedral faces may be partly or entirely absent. Ruby crystals are more often tabular, terminated by basal pinacoids,

Corundum Crystal habit: sapphire crystals are commonly prismatic while.

Corundum Crystal system: hexagonal-rhombohedral, bar3 2/m.

Chemical composition of Corundum:Al 2O 3, color is due to trace impurities of Cr, Fe and Ti.

Return to the Index of Corundum Mineral Information Topics

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Corundum ruby sapphire