mineral

Blue aventurine quartz (likely)

Quartz, silicon dioxide (SiO₂), probably blue aventurine variety

AI-generated identification · may be incorrect

Polished/tumbled, medium blue with subtle cloudy or sparkly inclusions and a vitreous-to-waxy luster; quartz hardness is Mohs 7, with no cleavage and conchoidal fracture. The rounded shape and polish obscure diagnostic crystal form.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in igneous or metamorphic environments; blue color commonly reflects dumortierite or other mineral inclusions. The specimen’s geological age cannot be determined from the photograph.

Uses & applications

Used mainly as a lapidary and ornamental stone for cabochons, beads, carvings, and collectors’ specimens; rarely used in construction. Blue aventurine is generally inexpensive.

Geological facts

Its blue appearance can overlap with blue quartz, dyed chalcedony, or synthetic glass, so visual identification is provisional. A strong sparkle would support aventurine quartz, while uniform color and bubbles could indicate glass.

Field identification & locations

Common sources include India, Brazil, Russia, and Zimbabwe. Check for hardness against glass, lack of bubbles, and a granular glitter; a gemological test for refractive index or specific gravity is more reliable.