metamorphic

Tumbled green aventurine (likely quartzite)

Aventurine quartzite; predominantly microcrystalline quartz (SiO₂) with green fuchsite mica or chlorite

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; opaque blue-green to mint-green, vitreous to waxy luster, granular quartz structure, no obvious cleavage, specific gravity about 2.6–2.7. The white patches are likely quartz-rich areas or surface abrasion/residue.

Identified September 13, 2026More metamorphic →

Explore Tumbled green aventurine (likely quartzite) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Tumbled green aventurine (likely quartzite)
Scientific name: Aventurine quartzite; predominantly microcrystalline quartz (SiO₂) with green fuchsite mica or chlorite
Category: metamorphic
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Typically $2–$15 for a small tumbled stone; fine, strongly glittery specimens or finished cabochons may sell for $10–$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

Formation & geological history

Forms when quartz-rich rock recrystallizes during metamorphism, with chromium-bearing fuchsite or chlorite producing the green color; commonly Precambrian to Paleozoic in age. It is later cut and polished into a tumbled stone.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and inexpensive decorative stone; generally a collector or lapidary material rather than a major construction stone.

Geological facts

True aventurine commonly shows subtle glitter from platy mica inclusions, called aventurescence; a non-sparkly specimen may be better termed green quartzite or green chalcedony.

Field identification & locations

Identify by its green color, quartz hardness, rounded polish, and possible mica sparkle; common sources include India, Brazil, Russia, and Tanzania. A steel file should not easily scratch it, while quartz will not scratch glass readily if the surface is clean.