mineral

Watermelon Tourmaline

Elbaite - Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3OH

Hardness: 7-7.5. Color: Bi-color or multi-color (pink/red core with green exterior). Luster: Vitreous. Crystal Structure: Trigonal (hexagonal prisms with striations). Cleavage: Indistinct. Specific Gravity: 3.0-3.3.

Hardness: 7-7
Color: Bi-color or multi-color (pink/red core with green exterior)
Luster: Vitreous

Identified March 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed in granitic pegmatites through hydrothermal processes. Most specimens date back millions of years. This specific color zoning occurs when changes in elements (like Manganese for pink and Iron/Chromium for green) occur during the crystal's growth.

Uses & applications

Predominantly used as a gemstone for jewelry (cabochons or faceted) and as a highly prized mineral specimen for collectors. Used in scientific instruments for its pyroelectric and piezoelectric properties.

Geological facts

Tourmaline is unique because it can become electrically charged when heated or squeezed. The 'Watermelon' variety was first coined by George Robley Howe in Maine, USA, but Brazil and Afghanistan produce the world's most famous specimens.

Field identification & locations

Identify in the field by looking for elongated prisms with vertical striations (parallel grooves) and a characteristic rounded triangular cross-section. Commonly found in Brazil, Nigeria, Madagascar, and Afghanistan. Collectors should look for 'clean' interiors and sharp color transitions.

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