mineral

Green tourmaline (likely chrome/dravite tourmaline crystals)

Tourmaline-group cyclosilicate; commonly elbaite, dravite, or chromdravite, complex borosilicate formula

AI-generated identification · may be incorrect

Small prismatic, striated crystals with strong vitreous luster and dark green to green-black color; typically trigonal, with no prominent cleavage and Mohs hardness 7–7.5. The image suggests separated or processed crystal fragments, but species-level identification requires testing.

Identified September 1, 2026More mineral →

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At a glance

Common name: Green tourmaline (likely chrome/dravite tourmaline crystals)
Scientific name: Tourmaline-group cyclosilicate; commonly elbaite, dravite, or chromdravite, complex borosilicate formula
Category: mineral
Identified: September 1, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for common small fragments; $50–$500+ for attractive transparent green crystals, with exceptional gem-quality specimens much higher.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Tourmaline forms in boron-rich granitic pegmatites, hydrothermal veins, and metamorphic rocks; crystals may be millions to billions of years old depending on the host deposit. Green varieties occur notably in Brazil, Afghanistan, Pakistan, Madagascar, Namibia, and parts of the United States.

Uses & applications

Gem-quality material is cut for jewelry; lesser crystals are collectible specimens and sources of tourmaline for geological and scientific study. Fine transparent green crystals can be valuable.

Geological facts

Tourmaline is strongly pleochroic and commonly develops lengthwise striations; heating or rubbing can produce electrical charge (the tourmaline effect).

Field identification & locations

Identify by elongated triangular-prismatic form, longitudinal grooves, glassy luster, hardness, and lack of cleavage; a gemological test is needed to distinguish elbaite from dravite or chromdravite. The pictured loose fragments may also be polished or cut material.