mineral

Polished watermelon tourmaline

Elbaite tourmaline, Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

AI-generated identification · may be incorrect

Hardness 7–7.5 Mohs; typically green with a pink-to-red core or bands, vitreous luster, and trigonal crystal structure. The pictured piece is a small polished or cut fragment; tourmaline has poor to indistinct cleavage and specific gravity about 3.0–3.3.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in lithium-rich granitic pegmatites when boron-bearing fluids crystallize during the late stages of magma cooling, generally in Precambrian to younger continental crust. Color zoning reflects changing chemistry during crystal growth.

Uses & applications

Used as a gemstone, ornamental cabochon, mineral specimen, and occasionally in jewelry; high-quality transparent material is valuable, while opaque polished pieces are commonly sold as affordable specimens.

Geological facts

The green-and-pink zoning gives it the name “watermelon tourmaline.” Tourmaline is strongly pleochroic and can become electrically charged when heated or rubbed (pyroelectric and piezoelectric).

Field identification & locations

Identify it by its vivid concentric or lengthwise green-pink zoning, glassy luster, hardness, and often triangular or striated crystal form; common sources include Brazil, Afghanistan, Nigeria, Madagascar, and the United States. Small polished pieces typically sell for $5–$30; fine gem-quality material can exceed $100–$1,000 per carat.