mineral

Green aventurine (likely)

Quartz, SiO₂, containing fuchsite mica or other green inclusions

AI-generated identification · may be incorrect

Pale green, granular and opaque to translucent, with a vitreous-to-waxy luster and possible subtle glitter; quartz hardness is about 7 Mohs, with no cleavage and irregular fracture. The pictured piece may also be a green-bearing metamorphic rock rather than pure aventurine.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when silica-rich fluids crystallize quartz around microscopic mica inclusions, commonly in metamorphic or hydrothermal settings; its exact age depends on locality. The specimen’s origin and geological age cannot be determined from the image alone.

Uses & applications

Used as a lapidary stone for carvings, beads, cabochons, and decorative objects; lower-grade material is sold as ornamental rough. It has limited industrial value compared with ordinary quartz.

Geological facts

Green color and aventurescence commonly result from fuchsite, a chromium-rich muscovite; hematite or goethite can produce red or brown varieties. Color alone is insufficient for reliable identification.

Field identification & locations

Look for quartz-like hardness, granular texture, and sparkly mica reflections; it should scratch glass but not be scratched by a steel knife. Common sources include India, Brazil, Russia, and Tanzania; acid testing is generally unhelpful.