mineral

Green aventurine (likely rough quartz)

Quartz, SiO₂, with green fuchsite inclusions

AI-generated identification · may be incorrect

The central specimen is opaque to translucent green with a vitreous to slightly waxy luster and irregular fracture. Quartz has Mohs hardness 7 and a trigonal crystal structure; the image alone cannot confirm aventurine or distinguish it from other green minerals.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich fluids or pegmatitic/hydrothermal processes; green color in aventurine typically comes from disseminated fuchsite mica. Its age depends on the source deposit and cannot be determined from appearance.

Uses & applications

Aventurine is used for beads, cabochons, carvings, and inexpensive decorative objects; rough pieces are also collected.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mineral inclusions; it is not clearly visible in this photo.

Field identification & locations

Check for a glassy luster, hardness near 7, and sparkly mica flecks; a scratch or hardness test should be done only with permission. Green quartz occurs in deposits worldwide, including India, Brazil, and Russia.