mineral

Polished green aventurine

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

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, green to brown-green, with a vitreous-to-waxy luster and granular quartz mosaic; cleavage is absent or poor. The subtle glittering aventurescence from mica inclusions may be visible under strong light.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich sandstone is metamorphosed and recrystallized, incorporating chromium-bearing fuchsite or chlorite; deposits are commonly Precambrian to Paleozoic. Common sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for beads, cabochons, carvings, tumbling, ornamental stone, and decorative objects; it is generally an inexpensive gemstone material.

Geological facts

Despite its gemstone trade name, aventurine is usually quartzite rather than a single mineral. Its green color is commonly caused by fuchsite, while iron-bearing inclusions can produce brown or reddish areas.

Field identification & locations

Identify it by its opaque green, granular appearance, hardness near quartz, and occasional glitter; it should not scratch easily with a steel knife. The pictured pieces appear polished and may be natural green aventurine quartzite, though visual inspection alone cannot confirm composition.