gemstone
Banded Agate (Eye Agate)
Silicon Dioxide (SiO2, microcrystalline quartz)
AI-generated identification · may be incorrectHardness 6.5–7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, displaying distinct concentric circular banding and orbicular patterns.
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Physical properties
Hardness 6.5–7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline structure, displaying distinct concentric circular banding and orbicular patterns.
Formation & geological history
Formed as secondary deposits within cavities in volcanic rocks where silica-rich fluids slowly precipitate in concentric layers.
Uses & applications
Predominantly polished into beads, cabochons, and ornamental talismans for jewelry crafting and metaphysical uses.
Geological facts
Naturally banded 'eye' agates have been crafted into amulets for millennia across Asia and the Mediterranean to ward off the 'evil eye.'
Field identification & locations
Identified by hardness (scratches glass), lack of visible crystalline cleavage, and typical orbicular or concentric banding. Common sources include India, Madagascar, and Brazil.
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