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Chemical Composition:
Li3Al6(BO3)3(Si6O18)
Group: Tourmaline
System: Hexagonal
Family: Silicates
Hardness: 7
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- Prismatic crystals, often elongated with vertical
striations
- Stubby crystals less frequent
- Conchoidal fracture
- Nonmetallic vitreous luster, tending towards resinous
on fracture surfaces
- Heavy
- Transparent to translucent
- Insoluble in acids
- Fusibility depends on the iron and magnesium content
- White streak
- Specific gravity 3.0 - 3.25
- Found in: Australia, Brazil, Italy, Mozambique,
Namibia, Sri Lanka, USA, former USSR
- Common
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