mineral
Tumbled agate
Chalcedony (microcrystalline quartz, SiO₂), likely banded agate
AI-generated identification · may be incorrectTranslucent orange-brown stone with faint curved bands and a polished, vitreous-to-waxy luster. Quartz hardness 6.5–7; trigonal crystal structure at the microscopic scale, with no obvious cleavage. The image alone cannot confirm the exact variety.
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Physical properties
Translucent orange-brown stone with faint curved bands and a polished, vitreous-to-waxy luster. Quartz hardness 6.5–7; trigonal crystal structure at the microscopic scale, with no obvious cleavage. The image alone cannot confirm the exact variety.
Formation & geological history
Agate forms as silica-rich fluids fill cavities in volcanic rock, depositing chalcedony in layers; ages vary widely, commonly millions to hundreds of millions of years. This specimen has been cut, shaped, and tumbled.
Uses & applications
Used for jewelry, beads, ornaments, and lapidary collections; agate is also used for small decorative objects and, historically, precision components.
Geological facts
Agate’s curved or concentric bands arise from successive silica deposits and may be subtle or hidden in small tumbled pieces.
Field identification & locations
Look for translucency, waxy polish, and curved bands; agates occur worldwide, including Brazil, Uruguay, India, and the United States. Similar orange chalcedony may lack visible banding.
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