Mineral
Agate (or Quartz with Agate banding)
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on Mohs scale. Translucent to semi-opaque, often with white, milky, or clear crystalline areas and distinct black or dark banding on the edge. Vitreous to waxy luster. Cryptocrystalline quartz structure.
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Physical properties
Hardness of 6.5-7 on Mohs scale. Translucent to semi-opaque, often with white, milky, or clear crystalline areas and distinct black or dark banding on the edge. Vitreous to waxy luster. Cryptocrystalline quartz structure.
Formation & geological history
Formed from silica-rich groundwater filling cavities in volcanic rocks over millions of years. Layers are deposited over time, creating bands.
Uses & applications
Commonly polished and shaped into cabochons for jewelry, decorative pieces, and lapidary arts.
Geological facts
Agate a variety of chalcedony. The dark banding seen on the edge is characteristic of onyx or dark agate layers.
Field identification & locations
Identifiable by its hardness (scratches glass), translucency, and often banded appearance. Agates are common worldwide, particularly in volcanic regions.
