gemstone
Agate
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7, waxy to vitreous luster, translucent appearance with banded microcrystalline quartz structure.
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Physical properties
Mohs hardness of 6.5 to 7, waxy to vitreous luster, translucent appearance with banded microcrystalline quartz structure.
Formation & geological history
Forms by the deposition of silica from groundwater in cavities of igneous and sedimentary rocks over millions of years.
Uses & applications
Widely used in jewelry, ornamental carvings, polished specimens, and industrial bearings.
Geological facts
Agate is a variety of chalcedony that often forms in ancient volcanic vesicles, preserving intricate color bands.
Field identification & locations
Identify by its waxy luster, conchoidal fracture, and characteristic translucent banding; common worldwide.
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