sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, translucent to opaque transparency, conchoidal fracture, and typically exhibits banded or layered patterns in various colors.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, translucent to opaque transparency, conchoidal fracture, and typically exhibits banded or layered patterns in various colors.
Formation & geological history
Formed primarily within the cavities of volcanic and metamorphic rocks through the slow deposition of silica-rich groundwater over millions of years.
Uses & applications
Used widely in ornamental objects, jewelry, polished specimens, precision instruments, and for making mortar and pestles due to its durability.
Geological facts
Agates are often found lining or filling cavities in ancient lavas, and individual bands can record changing chemical conditions during their formation.
Field identification & locations
Identified by its distinctive waxy luster, hardness, conchoidal fracture, and translucent banding. Commonly found in riverbeds, beaches, and volcanic regions worldwide.
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