mineral

Green tourmaline (verdite-like rough)

Likely elbaite, Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₄; identification from the photo is tentative

AI-generated identification · may be incorrect

Long, prismatic green crystal with lengthwise striations and vitreous-to-dull luster. Tourmaline is typically Mohs 7–7.5, trigonal, and has poor cleavage; the pictured specimen appears fractured and may be a rough crystal or mineral-rich rock.

Identified October 3, 2026More mineral →

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At a glance

Common name: Green tourmaline (verdite-like rough)
Scientific name: Likely elbaite, Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₄; identification from the photo is tentative
Category: mineral
Identified: October 3, 2026
Method: Standard

AI Estimated Value

About $5–$50 for a small, common rough specimen; gem-quality, well-formed crystals can be worth substantially more.

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 commonly crystallizes in lithium-rich granitic pegmatites and associated metamorphic rocks as magma cools; pegmatites range widely in age, from Precambrian to recent geological periods.

Uses & applications

Transparent material may be cut for jewelry; opaque or fractured pieces are used as mineral specimens and occasionally in decorative carvings.

Geological facts

Tourmaline crystals often show strong longitudinal striations and can be electrically polarized by heating or pressure (pyroelectric and piezoelectric effects).

Field identification & locations

Look for a distinctly prismatic form, prominent lengthwise grooves, and glassy surfaces; confirm with hardness and mineralogical testing, since several green minerals look similar. Tourmaline occurs worldwide, notably in Brazil, Afghanistan, Pakistan, and parts of Africa.