gemstone
Tumbled Agate
Silicon dioxide (chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, microcrystalline crystal structure, and conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, waxy to vitreous luster, microcrystalline crystal structure, and conchoidal fracture.
Formation & geological history
Formed in cavity-fillings of volcanic and metamorphic rocks through the deposition of silica-rich groundwater over millions of years.
Uses & applications
Widely used for tumbled decorative stones, jewelry making, lapidary art, and metaphysical crystal collecting.
Geological facts
Agate has been prized since antiquity for amulets and seals, with ancient Greeks and Romans using it for intaglio rings.
Field identification & locations
Identified by its distinctive banded patterns, translucent appearance, and hardness that scratches glass; commonly found globally in volcanic regions.
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