mineral

Tumbled blue aventurine quartz

Quartz (SiO₂), typically containing fuchsite or other mica inclusions

AI-generated identification · may be incorrect

Hardness 7 Mohs; pale blue-gray color, vitreous to subtly greasy luster, granular crystalline texture, and no obvious cleavage. The smooth surface indicates tumbling; the pale vein may be quartz or a minor fracture filling.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in rock cavities or veins, with trace inclusions producing the blue color; commonly Precambrian to younger, depending on source. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used as a lapidary stone, cabochon, carving material, and inexpensive collectible; tumbled pieces are also sold for decorative or metaphysical purposes.

Geological facts

Blue aventurine is less common than green or red aventurine. Its color is generally subdued and may overlap visually with blue quartz, quartzite, or dyed material.

Field identification & locations

Identify by its quartz hardness, cool blue-gray granular appearance, and possible subtle sparkle; it should scratch ordinary glass but not be scratched by a steel knife. Common sources include India, Brazil, Russia, and Tanzania.