mineral

Polished orange agate/jasper cabochon

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration; exact variety uncertain

AI-generated identification · may be incorrect

Orange-and-cream opaque to translucent, polished surface with mottled/banded pattern and vitreous to waxy luster. Mohs hardness 6.5–7; quartz has trigonal microcrystalline structure, no cleavage, and specific gravity about 2.6.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or fractures in volcanic rock, later developing chalcedony and iron staining; ages range from Paleozoic to Cenozoic depending on locality. The pictured piece is cut and polished.

Uses & applications

Used for cabochons, beads, carvings, and inexpensive jewelry; larger rough material is used for ornaments and decorative stone.

Geological facts

Agate is a banded variety of chalcedony, while jasper is generally more opaque and fine-grained. Orange color commonly comes from hematite or limonite inclusions.

Field identification & locations

Look for quartz-like hardness, lack of cleavage, waxy translucency, and natural banding or brecciation; it should scratch glass but not be scratched by a steel knife. Common sources include Brazil, Uruguay, India, Madagascar, Mexico, and the United States.