mineral
Polished agate slice
Agate, a banded variety of chalcedony (microcrystalline SiO₂)
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; translucent gray-brown interior with an orange-brown rind, vitreous to waxy luster, and no visible cleavage. The slice is polished; its internal crystal structure is cryptocrystalline quartz.
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Physical properties
Hardness 6.5–7 Mohs; translucent gray-brown interior with an orange-brown rind, vitreous to waxy luster, and no visible cleavage. The slice is polished; its internal crystal structure is cryptocrystalline quartz.
Formation & geological history
Agate forms as silica-rich fluids fill cavities, commonly in volcanic rocks, depositing chalcedony in layers. The specimen’s exact age and locality cannot be determined from the image.
Uses & applications
Used for jewelry, ornaments, display pieces, and small decorative objects; agate is also used for precision components and abrasives.
Geological facts
The contrasting outer rind and translucent interior are typical of many sliced agates; polishing enhances their color and patterns.
Field identification & locations
Look for waxy translucence, curved or concentric banding, and a hard, scratch-resistant surface. Agates occur worldwide, especially in volcanic regions; the pictured slice is likely a commercial decorative specimen.
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