mineral

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), colored by fuchsite/mica or other green inclusions

AI-generated identification · may be incorrect

Green, opaque, fine-grained and smoothly tumbled, with a matte-to-waxy luster and whitish quartz patches. Hardness about 6.5–7 Mohs; no obvious cleavage; specific gravity roughly 2.6–2.7.

Identified September 12, 2026More mineral →

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At a glance

Common name: Tumbled green aventurine (probable)
Scientific name: Quartzite dominated by quartz (SiO₂), colored by fuchsite/mica or other green inclusions
Category: mineral
Identified: September 12, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled piece; unusual color, strong aventurescence, or verified provenance may raise value to roughly $20–$50.

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

Green, opaque, fine-grained and smoothly tumbled, with a matte-to-waxy luster and whitish quartz patches. Hardness about 6.5–7 Mohs; no obvious cleavage; specific gravity roughly 2.6–2.7.

Formation & geological history

Formed when quartz-rich sandstone recrystallized into quartzite, with green chromium-bearing mica or related minerals introduced during metamorphism. Such material is generally Precambrian to younger, depending on locality.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, decorative objects, and inexpensive lapidary material; not typically used as structural stone in this form.

Geological facts

Aventurine’s characteristic glitter, called aventurescence, comes from reflective mica or hematite inclusions, though this specimen appears only weakly sparkly or may be green quartzite.

Field identification & locations

Common sources include India, Brazil, Russia, and Zimbabwe. Confirm with a bright light for mica sparkle and a scratch test against glass; green jasper or serpentine are plausible alternatives from this image alone.