mineral

Chalcedony (possibly agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

AI-generated identification · may be incorrect

The specimen appears translucent, pale honey-pink, and waxy to vitreous, with a rounded, broken surface. Quartz hardness is 7 Mohs; crystals are too fine to distinguish, and cleavage is absent. The photo does not show clear banding, so identification as agate is uncertain.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater deposits chalcedony in cavities and fractures, often in volcanic rocks. Formation age depends on the host deposit and cannot be determined from the image.

Uses & applications

Used for carvings, beads, cabochons, and decorative objects; common pieces are also collected as mineral specimens.

Geological facts

Chalcedony is quartz made of extremely fine intergrown crystals; iron impurities can produce warm yellow, orange, or pink hues.

Field identification & locations

Look for translucence, a waxy luster, and hardness sufficient to scratch glass; agate specifically has visible bands. Chalcedony occurs worldwide, including in Brazil, India, Uruguay, and the western United States.