mineral

Green aventurine quartz (probable)

Quartz, silicon dioxide (SiO₂), with green fuchsite or other inclusions

AI-generated identification · may be incorrect

Pale green, massive and granular with a dull-to-vitreous luster; hardness about 7 Mohs, no obvious cleavage, conchoidal fracture, and specific gravity near 2.65. The rough, irregular piece may also be green calcite or a serpentine mineral, which cannot be confirmed from the image alone.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when silica-rich fluids crystallize quartz containing dispersed chromium-bearing mica, commonly in metamorphic or hydrothermal settings. Its precise geological age depends on locality.

Uses & applications

Used for carvings, beads, cabochons, decorative stone, and inexpensive jewelry; rough pieces are popular among mineral collectors.

Geological facts

The characteristic sparkle of true aventurine comes from reflective mica platelets, called aventurescence, though this specimen appears only weakly sparkly.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. Check hardness with a steel file or glass, inspect for mica sparkle, and use acid or specific-gravity testing to distinguish it from calcite or serpentine.