mineral

Tumbled green aventurine

Quartzite dominated by microcrystalline quartz (SiO₂), commonly with fuchsite mica

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque to translucent green, vitreous to waxy luster, granular quartz crystal structure, and no prominent cleavage. The smooth surface and rounded contours indicate human tumbling/polishing.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Usually formed when quartz-rich sediments or igneous material are metamorphosed and recrystallized; green color commonly comes from chromium-bearing fuchsite or chlorite. Source rocks are generally Precambrian to Paleozoic, though exact age depends on locality.

Uses & applications

Used for carvings, cabochons, beads, tumbled stones, countertops, and decorative objects; popular in inexpensive jewelry and metaphysical collections.

Geological facts

Aventurine is named for aventurescence, a glittering effect caused by reflective inclusions, although this specimen appears mostly fine-grained and banded rather than strongly sparkly.

Field identification & locations

Identify by testing for quartz-like hardness, opaque green color, subtle parallel banding, and occasional mica glitter; it should scratch glass but not be scratched by a steel knife. Common sources include India, Brazil, Russia, and Zimbabwe.