gemstone
Agate
Silicon dioxide (SiO2), chalcedony variety
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, and specific gravity of 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, and specific gravity of 2.60 to 2.65.
Formation & geological history
Forms by the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks, often over millions of years.
Uses & applications
Widely used for making polished beads, jewelry, decorative ornaments, and precision instruments due to its durability.
Geological facts
These particular beads have been dyed a vibrant purple and orange color to enhance their decorative appeal in jewelry making.
Field identification & locations
Identified by its waxy luster, microcrystalline bands (when natural), and high hardness that scratches glass; commonly sourced globally including Brazil, India, and the USA.
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