mineral

Tumbled blue-green stone, likely aventurine or serpentine

Quartz-rich aventurine (SiO₂) or serpentine-group mineral; exact identification requires testing

AI-generated identification · may be incorrect

Opaque blue-green, fine-grained, vitreous to waxy luster with pale veining; likely Mohs hardness about 6–7 if aventurine, or 2.5–5.5 if serpentine. Tumbled and polished, with no visible cleavage.

Identified August 15, 2026More mineral →

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Physical properties

Opaque blue-green, fine-grained, vitreous to waxy luster with pale veining; likely Mohs hardness about 6–7 if aventurine, or 2.5–5.5 if serpentine. Tumbled and polished, with no visible cleavage.

Formation & geological history

Aventurine forms when quartz crystallizes with platy mica or other inclusions, commonly in metamorphic or hydrothermal settings; serpentine forms by alteration of ultramafic rocks. The specimen’s geological age cannot be determined from the image.

Uses & applications

Used as a lapidary material for cabochons, beads, carvings, and ornamental stones; generally decorative rather than industrial.

Geological facts

The blue-green color may result from fuchsite, amphibole, copper minerals, or serpentine rather than pure quartz. Color and veining alone are insufficient for a definitive identification.

Field identification & locations

Commonly sold as tumbled “blue aventurine,” serpentine, or occasionally chrysocolla; test hardness, streak, translucency, and specific gravity, and inspect with a loupe for quartz grains or mica sparkle. Common source regions include India, Brazil, Russia, and the United States.