mineral

Tumbled green aventurine (probable)

Quartz variety: aventurine quartz, SiO₂, colored commonly by fuchsite mica

AI-generated identification · may be incorrect

Pale green, smoothly tumbled, translucent to opaque, with a vitreous-to-waxy luster and no obvious cleavage; quartz hardness is about 7 Mohs and specific gravity about 2.6. The subdued color and cloudy texture may also indicate green chalcedony or nephrite, which cannot be confirmed from the photograph alone.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize quartz in metamorphic or hydrothermal environments; green color is typically produced by included chromium-bearing mica or other minerals. Aventurine deposits are commonly Precambrian to younger metamorphic rocks, depending on locality.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive tumbled-stone collections; it is less commonly used as a construction stone.

Geological facts

Aventurine’s characteristic aventurescence is caused by reflective mineral inclusions, though this specimen shows little visible sparkle. A glass scratch test or gemological examination can help distinguish it from dyed glass or softer green minerals.

Field identification & locations

Common sources include India, Brazil, Russia, Tanzania, and China. Look for tiny mica-like sparkles, quartz-like hardness, and absence of strong fibrous texture or perfect cleavage.