mineral

Polished green aventurine (likely)

Quartzite dominated by quartz (SiO₂), colored by fuchsite or chlorite inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; pale green to blue-green, waxy to vitreous luster, opaque to translucent, granular quartz structure, with no obvious cleavage. The spherical polished form and subtle color banding suggest a tumbled stone.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich sandstone recrystallizes under metamorphic conditions, with chromium-bearing mica or chlorite producing green color; typically Precambrian to Paleozoic deposits. Common sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive jewelry; also sold as a decorative healing stone. Less commonly used as architectural quartzite.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mica flakes, though this specimen appears relatively low in sparkle and could alternatively be green chalcedony or serpentine.

Field identification & locations

Check for tiny glittering reflections, quartz-like hardness, and resistance to scratching by steel; serpentine is softer, while dyed stones may show concentrated color in cracks. A photo alone cannot confirm the exact material.