mineral
Green aventurine (tumbled)
Quartz, SiO₂, with fuchsite or other mica inclusions
AI-generated identification · may be incorrectTypically 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.
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Physical properties
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.
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.
