mineral
Dyed blue quartz or druzy geode (likely)
Quartz, silicon dioxide (SiO₂), probably artificially colored
AI-generated identification · may be incorrectHardness 7 Mohs; vivid electric-blue color, vitreous to sparkling drusy luster, and microscopic quartz crystals lining cavities. The intense, uniform blue is atypical of natural quartz and suggests dye or coating; cleavage is absent and fracture is conchoidal.
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Physical properties
Hardness 7 Mohs; vivid electric-blue color, vitreous to sparkling drusy luster, and microscopic quartz crystals lining cavities. The intense, uniform blue is atypical of natural quartz and suggests dye or coating; cleavage is absent and fracture is conchoidal.
Formation & geological history
Likely a natural quartz-rich geode or botryoidal chalcedony specimen that was cut, opened, and dyed commercially; the original silica formed in volcanic cavities, commonly during the Cenozoic or older, depending on locality.
Uses & applications
Primarily sold as a decorative or collecting specimen; quartz is widely used in glass, electronics, abrasives, and jewelry, though dyed pieces have limited gem value.
Geological facts
Natural blue quartz is rare and usually pale; saturated cobalt-blue geodes are commonly treated. Dye may concentrate in cracks, porous chalcedony, or cavity surfaces.
Field identification & locations
Identify by sparkling quartz druse, a pale/gray outer rind, cavity lining, and color pooling in fractures; common commercial sources include Brazil, Uruguay, and Mexico. Avoid prolonged water, solvents, or sunlight, which may damage or fade treatment.
