mineral

Tumbled pale green aventurine or common green quartzite

Quartz, SiO₂, likely with fuchsite or chlorite inclusions

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale green, translucent, vitreous to waxy luster, granular crystalline structure, and no obvious cleavage. The smooth rounded shape indicates machine tumbling; visual identification alone is uncertain and could also fit serpentine or calcite.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz-rich material formed in metamorphic or hydrothermal environments, commonly during recrystallization of sandstone or silica-rich veins. Geological age depends on locality and cannot be determined from the specimen.

Uses & applications

Used as an inexpensive ornamental stone, bead, cabochon, and lapidary material; generally not suitable for major construction use.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mineral inclusions, though this specimen appears relatively uniform and non-sparkly.

Field identification & locations

Commonly found in India, Brazil, Russia, Tanzania, and China. Check hardness with a steel file or glass, inspect for glitter, and test density or streak; avoid acid testing unless calcite is suspected.