mineral

Green aventurine (probable)

Quartzite composed mainly of quartz (SiO₂), colored by fuchsite mica or other chromium-bearing minerals

AI-generated identification · may be incorrect

Green, granular and slightly sparkly with a vitreous-to-dull luster; quartz hardness is about 7 Mohs, with no prominent cleavage and specific gravity near 2.65. The specimen appears rough and natural, though lighting limits certainty.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich sandstone recrystallizes during metamorphism, incorporating green mica or related inclusions. Most commercial material comes from India, Brazil, Russia, and Tanzania; ages vary with the host formation.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and tumbled stones, and occasionally as decorative aggregate. It is popular but generally inexpensive.

Geological facts

Aventurine’s characteristic glitter, called aventurescence, comes from reflective mica or hematite inclusions. Green aventurine is commonly confused with jade, but it is usually less tough and more visibly granular.

Field identification & locations

Look for a green quartz-rich texture, scattered mica sparkle, hardness sufficient to scratch glass, and lack of fibrous structure. Estimated value: about $2–$15 for a small rough piece, or $10–$50 if unusually attractive.