mineral
Tumbled blue stone, likely blue aventurine or dyed quartzite
Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing
AI-generated identification · may be incorrectPolished, opaque-to-translucent deep blue surface with vitreous luster; quartz hardness about 7 Mohs, no visible cleavage, and specific gravity near 2.65. Its rounded form is mechanically tumbled and polished.
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Physical properties
Polished, opaque-to-translucent deep blue surface with vitreous luster; quartz hardness about 7 Mohs, no visible cleavage, and specific gravity near 2.65. Its rounded form is mechanically tumbled and polished.
Formation & geological history
If natural blue aventurine/quartzite, it formed from silica-rich fluids or metamorphosed quartz-bearing rock; geological age depends on locality. Strong uniform color may indicate dyeing or surface treatment.
Uses & applications
Commonly sold as a worry stone, lapidary cabochon, decorative object, or inexpensive collectible; not typically used in construction.
Geological facts
Blue quartz is uncommon, while commercially sold blue tumbled stones are often dyed quartzite, aventurine, or glass. A magnifier may reveal mica or hematite inclusions in natural aventurine.
Field identification & locations
Check for granular quartz texture, tiny reflective mica flakes, uneven dye concentration, and scratches that do not easily mark the surface. Common sources include Brazil, India, and Madagascar; hardness and streak tests help distinguish it from glass.
