mineral

Tumbled green aventurine (likely)

Quartz variety, SiO₂, colored mainly by fuchsite mica or other inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; pale green, translucent to semi-translucent, with a vitreous-to-waxy luster and usually massive, granular quartz structure. The visible white mottling suggests quartz veining or inclusions; characteristic aventurescence may be faint or absent.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize quartz with chromium-bearing mica inclusions, commonly in metamorphic or hydrothermal environments. The specimen is tumbled and polished, so its geological age cannot be determined from the image.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive decorative stone; occasionally used as architectural or lapidary material.

Geological facts

Aventurine is named for its glittering effect, caused by reflective mineral inclusions. Similar-looking green stones include dyed quartz, chrysoprase, jade, and green glass.

Field identification & locations

Identify by its hardness, cool feel, granular appearance, and resistance to scratching by steel; genuine aventurine commonly shows tiny mica sparkles under strong light. Common sources include India, Brazil, Russia, and Tanzania.