mineral

Green tourmaline crystal (likely elbaite)

Elbaite tourmaline, a complex borosilicate: Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

AI-generated identification · may be incorrect

Hardness 7–7.5 Mohs; typically green with a gray-white weathered or included surface, vitreous luster, trigonal crystal structure, and indistinct cleavage. The elongated, prismatic shape and strong color zoning are characteristic of tourmaline.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms in lithium-rich granitic pegmatites as magma cools, commonly during the Paleozoic to Mesozoic and younger pegmatite events. Common sources include Brazil, Afghanistan, Pakistan, Madagascar, Mozambique, and California, USA.

Uses & applications

Transparent gem-quality material is faceted for jewelry; lesser crystals are sold as mineral specimens or used in carvings and collectors’ pieces. Tourmaline’s piezoelectric and pyroelectric properties also have specialized technological applications.

Geological facts

The crystal appears natural but may be polished or lightly shaped; exact identification requires testing because epidote, beryl, and glassy imitations can resemble it. Green tourmaline is generally less valuable than vivid, transparent blue or neon-colored varieties.

Field identification & locations

Look for a three-sided or six-sided prismatic crystal, longitudinal striations, uneven termination, and color zoning; it should scratch glass but not be scratched by quartz. A gemological refractive-index or Raman test can confirm species.