mineral

Tumbled pink chalcedony (likely pink agate)

Chalcedony, microcrystalline SiO₂; variety of quartz

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; pale pink to cream with brown inclusions, waxy to vitreous luster, cryptocrystalline structure, no visible cleavage. The photo shows a small, polished/tumbled piece; exact variety cannot be confirmed from appearance alone.

Identified September 26, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited microscopic quartz in cavities or fractures, with trace impurities producing the color. Chalcedony forms in many geological ages and settings, commonly in volcanic rocks and sedimentary formations.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; also collected as a polished specimen.

Geological facts

Chalcedony is quartz whose crystals are too small to distinguish unaided; agate is typically banded chalcedony, though banding is not visible here.

Field identification & locations

Look for a smooth waxy surface, translucency at thin edges, and hardness sufficient to scratch glass; commonly found worldwide, including Brazil, India, Uruguay, and the United States.