mineral
Tumbled green aventurine
Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica or chlorite
AI-generated identification · may be incorrectTypically green, translucent to opaque, with a vitreous-to-waxy luster and subtle aventurescence from reflective mica inclusions; Mohs hardness 6.5–7, no prominent cleavage, granular quartz crystal structure, specific gravity about 2.6–2.7.
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Physical properties
Typically green, translucent to opaque, with a vitreous-to-waxy luster and subtle aventurescence from reflective mica inclusions; Mohs hardness 6.5–7, no prominent cleavage, granular quartz crystal structure, specific gravity about 2.6–2.7.
Formation & geological history
Forms when quartz-rich sedimentary or igneous material recrystallizes during metamorphism, incorporating green mica or chlorite; deposits are commonly Precambrian to younger metamorphic terrains. The pictured piece is polished/tumbled, with smoothly rounded edges.
Uses & applications
Used for beads, carvings, cabochons, ornamental objects, and inexpensive decorative stone; occasionally used as aggregate or architectural stone. It is generally a modest-value gemstone material.
Geological facts
Its green color is often caused by fuchsite mica, while chromium-bearing inclusions can intensify the color; natural aventurine commonly shows glittering aventurescence, though this specimen appears mostly waxy and opaque.
Field identification & locations
Identify by its green quartz-like body, hardness, rounded polish, and possible sparkles; distinguish it from softer dyed glass or green calcite with a hardness test. Common sources include India, Brazil, Russia, Tanzania, and China.
