mineral

Blue aventurine quartz (likely dyed or tumbled quartzite)

Quartz, silicon dioxide (SiO₂), with blue coloration from inclusions or dye

AI-generated identification · may be incorrect

Blue, opaque-to-translucent, glassy-to-waxy luster; typically quartz hardness ~7 Mohs, conchoidal fracture, no cleavage, and specific gravity ~2.65. The rounded, smooth surface indicates tumbling or polishing; uneven color may indicate dyeing.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Natural quartz-rich material formed in hydrothermal veins or metamorphic quartzite, generally from Precambrian to younger rocks; blue specimens may owe color to dumortierite inclusions, rare minerals, or artificial treatment.

Uses & applications

Used as an inexpensive lapidary stone for cabochons, carvings, beads, and polished collectibles; not generally used structurally.

Geological facts

Blue aventurine is often marketed under ambiguous trade names and is commonly confused with blue quartz, sodalite, or dyed quartzite. Aventurine’s characteristic aventurescence is usually caused by reflective mineral inclusions, though this piece shows little obvious sparkle.

Field identification & locations

Check for hardness with caution, inspect color concentration in cracks, and use a flashlight for translucency; dye often pools along fractures. Common sources include India, Brazil, Russia, and China.