gemstone
Blue Agate Geode Bookend
Silicon dioxide (chalcedony variety)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, exhibiting distinctive concentric blue and white bands.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, exhibiting distinctive concentric blue and white bands.
Formation & geological history
Formed through the deposition of silica-rich groundwater within vesicles of volcanic or metamorphic rocks over millions of years.
Uses & applications
Widely used for decorative home goods like bookends, polished display specimens, and jewelry-making.
Geological facts
This specimen has been dyed a vibrant blue to enhance the natural concentric banding visible on the polished face.
Field identification & locations
Easily identified by its curved concentric growth rings and waxy luster; commonly sourced from Brazil and Uruguay.
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