mineral
Watermelon Tourmaline
Elbaite (Na(Li,Al)3Al6(Si6O18)(BO3)3(OH)4)
Hardness: 7-7.5 (Mohs), Color: Pink center with green outer layer or bi-color, Luster: Vitreous, Structure: Trigonal, Cleavage: Indistinct, Specific Gravity: 3.0-3.3
- Hardness
- 7-7
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Physical properties
Hardness: 7-7.5 (Mohs), Color: Pink center with green outer layer or bi-color, Luster: Vitreous, Structure: Trigonal, Cleavage: Indistinct, Specific Gravity: 3.0-3.3
Formation & geological history
Formed in granitic pegmatites through hydrothermal processes where late-stage fluids are rich in boron, lithium, and other trace elements. Most specimens date from the Paleozoic to Mesozoic eras.
Uses & applications
Highly valued as a gemstone for jewelry, particularly rings and pendants that showcase the color zoning; also a popular specimen for mineral collectors.
Geological facts
The name comes from the visual similarity to a sliced watermelon. It is pleochroic, meaning its color can appear to change when viewed from different angles. It is also piezoelectric, meaning it can generate an electrical charge under pressure.
Field identification & locations
Identify by finding pink and green concentric or side-by-side color zones within the same crystal. Commonly found in Brazil, Madagascar, Nigeria, and Afghanistan. Collectors look for clarity and sharp color transitions.
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