mineral
Blue Agate (Dyed or Treated Chalcedony)
Silicon Dioxide (SiO2), microcrystalline quartz variety
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster when polished, conchoidal fracture, trigonal crystal system with cryptocrystalline structure, specific gravity around 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster when polished, conchoidal fracture, trigonal crystal system with cryptocrystalline structure, specific gravity around 2.60 to 2.65.
Formation & geological history
Formed through the deposition of silica from groundwater, typically in cavities of volcanic and metamorphic rocks. Often subjected to commercial dying or enhancement to achieve vibrant blue colors.
Uses & applications
Commonly used for tumbled stones, decorative objects, metaphysical healing, and inexpensive jewelry pieces.
Geological facts
Natural blue chalcedony exists, but intensely bright, variegated blue tumbled stones like this are frequently created by dying porous chalcedony or agate with dye solutions.
Field identification & locations
Identified by its waxy luster, hardness that can scratch glass, and lack of distinct cleavage. Often found in mineral shops worldwide as a popular entry-level tumbled stone.
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