mineral
Agate
Cryptocrystalline quartz, Chalcedony (SiO2)
AI-generated identification · may be incorrectMohs hardness 6.5-7. Waxy luster. Color variations include brown, orange, white banding. Cryptocrystalline structure. No cleavage.
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Physical properties
Mohs hardness 6.5-7. Waxy luster. Color variations include brown, orange, white banding. Cryptocrystalline structure. No cleavage.
Formation & geological history
Forms in voids of volcanic rocks or ancient lavas. Ground waters carrying silica seep into these voids, depositing layers of silica.
Uses & applications
Lapidary material, jewelry making, ornamental stone, rock collecting.
Geological facts
Agate was highly valued as a talisman or amulet in ancient times. It was believed to quench thirst and protect from fevers.
Field identification & locations
Identify by its waxy luster, conchoidal fracture, and often by banding or distinct patterns. Commonly found worldwide in volcanic areas or as alluvial deposits.
