mineral
Polished agate slice
Microcrystalline quartz (SiO₂), chiefly chalcedony
AI-generated identification · may be incorrectSmall, pale cream-white polished piece with faint concentric banding and a waxy to vitreous luster. Quartz hardness is 6.5–7 Mohs; trigonal crystal structure at the microscopic level, with no cleavage and conchoidal fracture.
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Physical properties
Small, pale cream-white polished piece with faint concentric banding and a waxy to vitreous luster. Quartz hardness is 6.5–7 Mohs; trigonal crystal structure at the microscopic level, with no cleavage and conchoidal fracture.
Formation & geological history
Agate forms as silica-rich fluids fill cavities in volcanic rock, depositing layers over time. The specimen’s geological age and source cannot be determined from the image.
Uses & applications
Agate is used for jewelry, ornaments, cabochons, and small decorative carvings; value depends on size, pattern, and finish.
Geological facts
Agate is a banded variety of chalcedony; its fine bands can record successive mineral deposition.
Field identification & locations
Look for translucent chalcedony and curved or concentric bands; common sources include Brazil, Uruguay, India, and the United States. The pictured object appears to be a small cut and polished slice.
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