mineral

Tumbled orange-and-white chalcedony (likely carnelian agate)

Microcrystalline quartz, SiO₂; chalcedony colored by iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent white and orange-brown, with a waxy to vitreous luster and no visible cleavage. The rounded shape and smooth surface indicate tumbling; the photo does not show enough detail to confirm agate banding.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited quartz in cavities or fractures, later colored by iron oxides; chalcedony forms in many geological settings and can range from young deposits to ancient rock. Common sources include Brazil, India, Madagascar, and Uruguay.

Uses & applications

Used for beads, cabochons, ornaments, and collectibles; lower-grade material may be used decoratively.

Geological facts

Carnelian is the orange-red variety of chalcedony; iron content and oxidation state create its warm colors.

Field identification & locations

Look for a hard, smooth, waxy surface and translucence at thin edges; agate often shows curved bands when cut. A photo cannot establish locality or confirm banding.