mineral
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness 6.5-7, deep royal blue to dark indigo color with glossy vitreous luster, microcrystalline trigonal structure, smooth tumbled texture.
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Physical properties
Mohs hardness 6.5-7, deep royal blue to dark indigo color with glossy vitreous luster, microcrystalline trigonal structure, smooth tumbled texture.
Formation & geological history
Formed by low-temperature deposition of silica from water in cavities within volcanic or metamorphic rocks, subsequently tumbled and dyed blue.
Uses & applications
Popular in lapidary work, jewelry making, polished tumbled stone collections, and ornamental decor.
Geological facts
Agate is naturally porous, which allows it to readily accept chemical dyes to produce vibrant blues, pinks, and purples not often seen in raw quartz.
Field identification & locations
Identified by its microcrystalline smooth structure, hardness, and intense artificial coloration; frequently available at crystal shops and rock shows worldwide.
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Sandstone (with potential mineral staining/concretions)
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Granite
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igneous
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral