mineral

Polished orange agate or chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/agate

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent orange-brown with pale gray-purple zones, waxy-to-glassy luster, and no visible cleavage. Its rounded, highly polished form is human-shaped; specific gravity is approximately 2.6.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities in volcanic rock, with iron oxides producing orange-brown coloration; banding or clouding develops during repeated silica deposition. The specimen’s exact geological age cannot be determined visually.

Uses & applications

Used for cabochons, carvings, worry stones, and decorative objects; durable enough for jewelry and ornamental work.

Geological facts

Agate is a variety of chalcedony distinguished by patterned or banded microcrystalline quartz; orange color commonly reflects hematite or limonite inclusions.

Field identification & locations

Identify by its glassy/waxy polish, translucency, quartz hardness, and lack of cleavage; it commonly occurs in volcanic regions worldwide, including Brazil, Uruguay, India, Madagascar, and the United States. A steel file should not easily scratch it.