mineral

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green fuchsite mica inclusions

AI-generated identification · may be incorrect

Typically translucent to opaque green, vitreous to slightly waxy luster, granular texture, and no obvious cleavage; Mohs hardness 6.5–7, specific gravity about 2.6–2.7. The pictured piece appears tumbled and may be polished or coated.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich rock recrystallizes and incorporates chromium-bearing fuchsite or other green minerals; deposits are commonly Precambrian to younger metamorphic rocks. Major sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for carvings, cabochons, beads, ornamental stone, and inexpensive jewelry; larger slabs serve as decorative stone. It is also popular as a collecting and lapidary material.

Geological facts

Aventurescence—sparkling reflections from mica inclusions—is diagnostic, though this specimen appears relatively low-sparkle. Similar green glass, serpentine, jade, or dyed quartz can be confused with it.

Field identification & locations

Look for uneven natural green color, tiny reflective mica flakes, quartz-like hardness, and a white streak; glass commonly shows bubbles and softer imitations scratch more easily. The photograph alone cannot confirm the identification.