mineral
Green aventurine (likely)
Quartzite composed mainly of quartz (SiO₂), colored by fuchsite or other chromium-bearing mica
AI-generated identification · may be incorrectA polished/tumbled green sphere with vitreous to waxy luster; quartz hardness about 7 Mohs, typically pale to medium green, massive and granular, with no obvious cleavage. The image lacks enough detail to confirm identity; jade, serpentine, or dyed stone are alternatives.
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Physical properties
A polished/tumbled green sphere with vitreous to waxy luster; quartz hardness about 7 Mohs, typically pale to medium green, massive and granular, with no obvious cleavage. The image lacks enough detail to confirm identity; jade, serpentine, or dyed stone are alternatives.
Formation & geological history
Usually forms when quartz-rich sandstone is metamorphosed into quartzite, with green mica inclusions producing the color; commonly Precambrian to younger metamorphic material. Commercial material is especially associated with India, Brazil, Russia, and Tanzania.
Uses & applications
Used for beads, carvings, spheres, ornamental objects, and inexpensive jewelry; it is not generally used as a major construction stone in this form.
Geological facts
Aventurine’s characteristic aventurescence is caused by reflective mica flakes, though this specimen appears relatively uniform and may have little visible sparkle.
Field identification & locations
Check for tiny mica flashes, hardness, and density; quartzite should resist scratching by steel, whereas serpentine and dyed softer stones may not. Common rough sources include India and Brazil.
