mineral
Blue aventurine or dyed blue chalcedony (tumbled stone)
Likely microcrystalline quartz, SiO₂; exact identification requires testing
AI-generated identification · may be incorrectSmooth, rounded, opaque-to-translucent dark blue stone with vitreous to waxy luster. Quartz hardness is Mohs 7, with no cleavage and conchoidal fracture; blue aventurine may contain reflective fuchsite or other inclusions, while dyed chalcedony is typically uniform.
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Physical properties
Smooth, rounded, opaque-to-translucent dark blue stone with vitreous to waxy luster. Quartz hardness is Mohs 7, with no cleavage and conchoidal fracture; blue aventurine may contain reflective fuchsite or other inclusions, while dyed chalcedony is typically uniform.
Formation & geological history
Quartz-rich material forms in silica-bearing veins, cavities, or volcanic and hydrothermal environments; chalcedony commonly develops from silica-rich groundwater. Geological age depends on its source, and tumbling is human processing.
Uses & applications
Used as a decorative, lapidary, and jewelry stone; commonly sold as an inexpensive tumbled specimen.
Geological facts
The photograph alone cannot reliably distinguish blue aventurine, sodalite, dyed quartz, or dyed chalcedony. A streak, hardness, loupe, and specific-gravity test would improve identification.
Field identification & locations
Look for quartz-like hardness, conchoidal chips, and natural glitter in aventurine; dye often concentrates in cracks or produces unnaturally even color. Common commercial sources include Brazil, India, Madagascar, and China.
