mineral

Tumbled blue quartz (likely blue aventurine)

Quartz, silicon dioxide (SiO₂), colored by microscopic inclusions—possibly dumortierite or amphibole

AI-generated identification · may be incorrect

Rounded, polished specimen with blue-gray color, white internal mottling, and vitreous to waxy luster. Quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-rich veins or metamorphic rocks, with trace mineral inclusions producing the blue color; the specimen was subsequently tumbled and polished. Its exact geological age and locality cannot be determined from the image.

Uses & applications

Used as a decorative stone, lapidary material, ornament, and inexpensive metaphysical collectible; not generally a precious gemstone.

Geological facts

Natural blue quartz is uncommon, and many commercial pieces sold as “blue aventurine” are quartz containing blue mineral inclusions. Strong glassy luster and resistance to scratching distinguish it from dyed glass or calcite.

Field identification & locations

Commonly found in quartz-bearing metamorphic and hydrothermal deposits, including localities in Brazil, India, and Madagascar. A steel file should not readily scratch it; inspect for granular inclusions and conchoidal fracture.