mineral

Green aventurine (tumbled)

Quartz, SiO₂, with fuchsite or other mica inclusions

AI-generated identification · may be incorrect

Typically pale to medium green, translucent to opaque, with a vitreous-to-waxy luster; Mohs hardness 7, trigonal crystal structure, no true cleavage, and specific gravity about 2.6–2.7. This specimen appears smoothly tumbled and may be dyed glass or another imitation, as no characteristic aventurescence is visible.

Identified September 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich rock crystallizes with microscopic green fuchsite mica or related inclusions, commonly in metamorphic environments. Most commercial material comes from India, Brazil, Russia, and Tanzania; its geological age varies by deposit.

Uses & applications

Used for carvings, beads, cabochons, decorative stone, and inexpensive metaphysical specimens; it is occasionally used in countertops and ornamental objects.

Geological facts

The glittering effect called aventurescence results from reflective mica platelets; a uniformly green, non-sparkling appearance can indicate dyed quartzite or glass.

Field identification & locations

Identify genuine material by its quartz-like hardness, cool feel, irregular grain, and usually subtle glitter; it should scratch glass but not be scratched by steel. Common tumbled pieces are worth about $1–$10; larger vivid, naturally aventurescent pieces may bring $20–$100.