mineral
Tumbled blue stone, likely blue aventurine or dyed quartz
Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing
AI-generated identification · may be incorrectSmall polished/tumbled piece with dark blue-gray color, subtle speckling, and vitreous-to-waxy luster. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; dyeing or another mineral is possible.
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Physical properties
Small polished/tumbled piece with dark blue-gray color, subtle speckling, and vitreous-to-waxy luster. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; dyeing or another mineral is possible.
Formation & geological history
If natural aventurine, it formed when silica-rich fluids crystallized quartz with microscopic inclusions, commonly in veins or metamorphic rocks. The specimen’s geological age and treatment cannot be determined from the image.
Uses & applications
Used mainly as a pocket stone, ornamental pebble, or inexpensive jewelry material; quartz-rich material can also be used decoratively and industrially.
Geological facts
Blue aventurine is less common than green or orange aventurine, while dyed quartz and blue glass are frequent substitutes in commercial tumbles.
Field identification & locations
Quartz should scratch glass but not be scratched by a steel knife; glassy translucence, irregular inclusions, and lack of bubbles support quartz. Common sources include Brazil, India, Russia, and Madagascar; visual identification alone is uncertain.
