mineral

Tumbled green aventurine (probable)

Quartz, SiO₂, with fuchsite or other mica inclusions

AI-generated identification · may be incorrect

Pale green, frosted/tumbled surface, vitreous to silky luster, typically Mohs hardness 7, no obvious cleavage, and specific gravity about 2.6–2.7. The rounded shape indicates human tumbling or natural water abrasion.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-rich metamorphic or hydrothermal environments when quartz crystallizes around green mica inclusions; most commercial material comes from India, Brazil, or Russia. Geological ages vary by deposit, commonly Precambrian to younger.

Uses & applications

Used for inexpensive cabochons, beads, carvings, ornamental objects, and lapidary collections; rarely used industrially because of its small specimen size.

Geological facts

Aventurine’s green color is usually caused by fuchsite mica, while aventurescence is produced by reflective inclusions. The pictured specimen lacks strong sparkle, so pale green quartzite or serpentine is also possible.

Field identification & locations

Identify by hardness: it should scratch glass but not be scratched by a steel knife; green mica glitter supports aventurine. Serpentine is softer, waxier, and often darker green.