mineral

Blue aventurine quartz (likely)

Quartz, silicon dioxide (SiO₂), with blue color from inclusions such as dumortierite or other minerals

AI-generated identification · may be incorrect

Hardness 7 Mohs; pale to medium blue, opaque to translucent, with a waxy-to-glassy luster and no obvious cleavage. The smooth, rounded shape indicates a tumbled or polished specimen; crystal structure is trigonal.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in igneous or metamorphic rocks, with microscopic inclusions producing the blue color. The specimen’s geological age cannot be determined from the photograph; deposits occur in several Precambrian to younger terrains.

Uses & applications

Used as a decorative stone, cabochon, bead, and inexpensive collector material; it is less commonly used in high-end jewelry than sapphire or blue chalcedony.

Geological facts

Blue aventurine is often confused with sodalite, blue calcite, blue quartz, or dyed stones. Natural material usually shows cloudy color variation and may contain tiny reflective inclusions.

Field identification & locations

Common sources include India, Brazil, Russia, and parts of the United States. A glass scratch test should be avoided on the polished surface; quartz typically scratches glass, while calcite does not, and a gemological test is needed for certainty.