mineral
Polished agate pebble
Chalcedony (microcrystalline quartz, SiO₂), likely agate
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; muted gray, cream, and reddish-brown patterns with a waxy to subdued vitreous luster. Agate is microcrystalline quartz; the image shows a rounded, polished specimen with no obvious cleavage.
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Physical properties
Hardness 6.5–7 Mohs; muted gray, cream, and reddish-brown patterns with a waxy to subdued vitreous luster. Agate is microcrystalline quartz; the image shows a rounded, polished specimen with no obvious cleavage.
Formation & geological history
Silica-rich groundwater deposited successive layers in a cavity or fracture, later hardened and exposed by erosion. Agates form in many geological settings and ages; this image cannot establish a specific source or age.
Uses & applications
Primarily collected or used as a decorative stone; agate is also cut for jewelry, ornaments, and small objects.
Geological facts
Agate is a banded variety of chalcedony, though bands may be subtle or irregular rather than vivid.
Field identification & locations
Look for hardness, waxy luster, and curved or irregular internal color zones; common sources include volcanic rocks and stream gravels worldwide. Its exact variety cannot be confirmed from the photograph.
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