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Chemical Composition:
Al2O3
Group: -
System: Hexagonal
Family: Oxides
Hardness: 9
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- Hexagonal, barrel-shaped crystals with either tapered
or stubby terminations
- Variable in colour, sometimes spotted
- Other colours: gray, brown, blue, yellow, green,
purple, colourless
- Transparent to translucent
- Heavy
- Infusible and insoluble
- Found in: Afghanistan, Australia, Brazil, Burma,
Greece, India, Italy, Piedmont, South Africa, Sri Lanka,
Tanzania, Thailand, Turkey, USA
- Used as abrasive and in mechanical precision
engineering
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