mineral
Blue-dyed tumbled stone, likely calcite or quartz
Uncertain; commonly dyed quartz (SiO₂) or calcite (CaCO₃)
AI-generated identification · may be incorrectBright cobalt-blue, opaque to translucent, glassy to waxy luster, rounded from tumbling, with possible dye concentration in fractures. Quartz has Mohs hardness 7; calcite is 3 and effervesces weakly in dilute acid.
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Physical properties
Bright cobalt-blue, opaque to translucent, glassy to waxy luster, rounded from tumbling, with possible dye concentration in fractures. Quartz has Mohs hardness 7; calcite is 3 and effervesces weakly in dilute acid.
Formation & geological history
The underlying stone formed naturally, but its intense blue color is likely artificial dye applied after cutting and tumbling. Geological age and source cannot be determined from the photograph.
Uses & applications
Sold as an inexpensive decorative or metaphysical stone; occasionally used in crafts and collections, but not generally as fine jewelry.
Geological facts
The vivid, strongly saturated blue is atypical of most natural blue minerals and commonly indicates dyed material. Dye may fade or transfer with solvents, heat, or prolonged sunlight.
Field identification & locations
Check hardness, streak, acid reaction, and dye in cracks or on porous surfaces; avoid destructive tests if valuable. Similar commercial stones are widely produced from quartz, calcite, or marble in lapidary markets.
