mineral

Tumbled pale agate or chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony/agate

AI-generated identification · may be incorrect

Small polished, translucent cream-to-pink specimen with orange-brown internal bands or inclusions and a waxy-to-glassy luster. Quartz hardness is about 7 Mohs; it has a cryptocrystalline structure, no visible cleavage, and specific gravity near 2.6.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities in volcanic rock, depositing successive layers of chalcedony and quartz. The exact age cannot be determined visually; agates occur in volcanic rocks from many geologic periods.

Uses & applications

Used for cabochons, beads, ornaments, paperweights, and educational collections; this small piece has modest commercial value.

Geological facts

Agate’s curved or concentric banding reflects changing chemistry during cavity filling. The orange coloration commonly comes from iron oxides or hydroxides.

Field identification & locations

Identify it by its translucency, waxy polish, hardness, and fine curved banding; it should resist scratching by a steel knife but be scratched by quartz. Common sources include Brazil, Uruguay, India, Madagascar, and the western United States.