mineral
Polished agate (possibly carnelian)
Microcrystalline quartz, SiO₂; likely chalcedony/agate
AI-generated identification · may be incorrectSmall polished translucent brown-orange stone with pale banding or inclusions and a glassy-to-waxy luster. Mohs hardness 6.5–7; trigonal quartz structure, no cleavage, conchoidal fracture; specific gravity about 2.6.
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Physical properties
Small polished translucent brown-orange stone with pale banding or inclusions and a glassy-to-waxy luster. Mohs hardness 6.5–7; trigonal quartz structure, no cleavage, conchoidal fracture; specific gravity about 2.6.
Formation & geological history
Agate forms as silica-rich fluids fill cavities in volcanic rock, depositing chalcedony in layers; the specimen’s precise age and locality cannot be determined from the image.
Uses & applications
Used for beads, cabochons, carvings, and inexpensive jewelry or collections.
Geological facts
Agate’s characteristic bands form through successive silica deposition; a uniformly reddish-orange variety is often called carnelian.
Field identification & locations
Look for translucency, hardness, and curved or concentric bands; common sources include Brazil, Uruguay, India, and the western United States. A tiny polished piece like this typically sells for about $1–$10.
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