mineral
Tumbled green aventurine (likely)
Quartzite dominated by quartz (SiO₂), with green fuchsite mica inclusions
AI-generated identification · may be incorrectTypically Mohs hardness 6.5–7, vitreous to waxy luster, translucent green color, and granular quartz texture; cleavage is absent or poor. The rounded shape indicates machine tumbling and polishing.
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Physical properties
Typically Mohs hardness 6.5–7, vitreous to waxy luster, translucent green color, and granular quartz texture; cleavage is absent or poor. The rounded shape indicates machine tumbling and polishing.
Formation & geological history
Usually formed when quartz-rich sediment or rock recrystallizes into quartzite, with chromium-bearing fuchsite producing the green color; most commercial material comes from India, Brazil, or Russia. The rock may be Precambrian or younger depending on locality.
Uses & applications
Commonly sold as a low-cost tumbled stone, cabochon, bead, carving material, and ornamental aggregate; it is also used in decorative objects and metaphysical collections.
Geological facts
Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mica or hematite inclusions, though this specimen appears relatively subdued and may be green quartzite rather than classic aventurine.
Field identification & locations
Identify it by its green translucent body, granular texture, lack of cleavage, and possible mica glitter; it should scratch glass but not corundum. Confirmatory identification requires magnification or mineralogical testing because dyed chalcedony and other green stones can look similar.
