mineral

Tumbled green aventurine (likely)

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; pale to medium green, translucent to opaque, with a vitreous-to-waxy polished luster. Usually granular quartz with no prominent cleavage; specific gravity about 2.6–2.7.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich rock recrystallizes and incorporates chromium-bearing fuchsite or similar mica. Green aventurine commonly comes from Proterozoic metamorphic terrains, especially India, Brazil, Russia, and Tanzania.

Uses & applications

Used for inexpensive cabochons, beads, carvings, ornamental objects, and tumbled stones; it is not generally used as a major construction stone.

Geological facts

The specimen’s rounded, polished shape indicates human tumbling. Strong glitter, called aventurescence, is typical when abundant mica reflects light, though this example appears relatively low-glitter.

Field identification & locations

Identify by its green quartz-rich body, glassy polish, and possible fine mica sparkle; distinguish it from softer green calcite or serpentine with a scratch test. Exact identification requires testing because jade, chalcedony, and dyed quartz can look similar.