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Chemical Composition: Complex borosilicates
Group: Tourmaline
System: Hexagonal
Family: Silicates
Hardness: 7
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- Prismatic crystals
- Heavy
- Transparent to translucent
- Insoluble in acids
- Fusibility depends on the iron and magnesium content
- Found in: Australia, Brazil, Italy, Mozambique,
Namibia, Sri Lanka, USA, former USSR
- Common
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