mineral
Blue aventurine quartz (likely)
Quartz, silicon dioxide (SiO₂), probably blue aventurine variety
AI-generated identification · may be incorrectPolished/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.
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Physical properties
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.
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.
