mineral
Banded agate pebble
Microcrystalline quartz (chalcedony), SiO₂
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; cream, tan, and rusty-orange bands with a waxy to vitreous luster. Cryptocrystalline quartz; no visible cleavage, with conchoidal fracture. The image shows a naturally rounded, possibly polished pebble.
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Physical properties
Hardness 6.5–7 Mohs; cream, tan, and rusty-orange bands with a waxy to vitreous luster. Cryptocrystalline quartz; no visible cleavage, with conchoidal fracture. The image shows a naturally rounded, possibly polished pebble.
Formation & geological history
Silica-rich fluids deposited successive chalcedony layers in a cavity or fracture, commonly in volcanic rock. The exact age and locality cannot be determined from the image.
Uses & applications
Used for jewelry, ornaments, and lapidary collecting; agate is also used for decorative objects and, historically, precision components.
Geological facts
Agate’s contrasting bands record changes in silica deposition and trace impurities during growth.
Field identification & locations
Look for fine, curved or parallel bands and a waxy surface; it is commonly found in volcanic regions and stream gravels. Similar-looking banded stones may need close inspection to distinguish from other chalcedony.
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