mineral

Tumbled green aventurine (probable)

Quartz variety: green aventurine, SiO₂, colored commonly by fuchsite mica or chlorite

AI-generated identification · may be incorrect

Hardness about 7 Mohs; translucent to opaque green with a vitreous polish and possible subtle aventurescence (sparkling reflections). Massive, microcrystalline quartz; no obvious cleavage, specific gravity about 2.6–2.7.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich material crystallizes with green fuchsite mica or chlorite, typically in metamorphic or hydrothermal environments. The pictured piece is polished/tumbled, obscuring its original texture and age.

Uses & applications

Used for inexpensive cabochons, beads, carvings, décor, and metaphysical collectibles; it is not generally used as a major construction stone.

Geological facts

The green color is usually caused by chromium-bearing fuchsite rather than the quartz itself. Similar-looking material may be green quartzite, jade, or dyed chalcedony.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. Look for relatively even green color, quartz-like hardness, and glittering mica; it should scratch glass, while a steel blade normally does not scratch it.