mineral

Black tourmaline pendant

Schorl tourmaline, NaFe3Al6(BO3)3Si6O18(OH)4

AI-generated identification · may be incorrect

Black, opaque, vitreous-to-resinous luster; trigonal crystal structure with strong longitudinal striations and indistinct cleavage. Mohs hardness 7–7.5; specific gravity about 3.1–3.3. The image shows a polished, faceted pendant set in metal.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in boron-rich hydrothermal veins and granitic pegmatites, commonly during late-stage granite crystallization. Tourmaline occurs in rocks ranging from Paleozoic to modern geological settings, depending on locality.

Uses & applications

Used as a gemstone, ornamental material, and metaphysical collectible; it is also valued for piezoelectric and pyroelectric properties. This specimen is jewelry rather than a construction stone.

Geological facts

Schorl is the most common tourmaline variety and owes its black color primarily to iron. Heating or pressure can produce electrical charge, a defining tourmaline property.

Field identification & locations

Identify by its black color, glassy luster, elongated striated crystals, high hardness, and lack of obvious cleavage; test cautiously because it is mounted and polished. Common sources include Brazil, Afghanistan, Madagascar, Namibia, and the United States.