mineral

Green aventurine cabochon (probable)

Quartzite dominated by quartz (SiO₂), with green fuchsite mica or chlorite inclusions

AI-generated identification · may be incorrect

Small polished, domed cabochon with opaque emerald-green color and vitreous-to-waxy luster; quartz hardness is about 7 Mohs, with no visible cleavage and a granular crystalline structure. The uniformly smooth appearance may also indicate dyed chalcedony or glass, so identification is provisional from the image.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Natural aventurine forms when quartz-rich rock recrystallizes and incorporates green mica or chlorite; quartzites are commonly Precambrian to younger metamorphic rocks. Green color results from dispersed chromium-bearing fuchsite or chlorite.

Uses & applications

Used for inexpensive cabochons, beads, carvings, and decorative objects; occasionally used as aggregate or ornamental stone. Common commercial pieces are valued mainly for color and polish.

Geological facts

Aventurine’s characteristic aventurescence is caused by reflective mineral inclusions, though this specimen shows little obvious sparkle. A hardness or refractive-index test would distinguish it from glass or dyed material.

Field identification & locations

Commonly found in India, Brazil, Russia, Tanzania, and China; identify with a strong flashlight for sparkle, a 7-Mohs scratch test, and magnification for mica flakes. Avoid destructive testing on finished jewelry.