gemstone
Blue Agate
Silicon dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline crystal structure, conchoidal fracture with no distinct cleavage, and specific gravity of 2.58 to 2.64.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, microcrystalline crystal structure, conchoidal fracture with no distinct cleavage, and specific gravity of 2.58 to 2.64.
Formation & geological history
Formed by the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks, typically over millions of years.
Uses & applications
Widely used in jewelry, ornamental carvings, polished specimens, and lapidary art.
Geological facts
Agate bands represent successive layers of deposition, often enhanced by artificial dyeing to achieve vibrant blue hues like this tumbled specimen.
Field identification & locations
Easily identified by its distinct curved banding and waxy luster; found globally in volcanic rock cavities, particularly in Brazil, India, and the USA.
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