sedimentary

Band Agate / Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Hardness: 6.5 - 7 on Mohs scale. Luster: Vitreous to waxy. Color: White, cream, brown, reddish-brown, and earthy tones with distinct banding patterns. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Fracture: Conchoidal.

Hardness: 6
Luster: Vitreous to waxy

Identified July 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed via secondary chemical precipitation of silica-rich fluids within cavities of volcanic or sedimentary rocks over millions of years. Mineral impurities like iron oxide create the distinct brownish and reddish banding.

Uses & applications

Popular as tumbled lapidary stones, decorative carvings, cabochons for jewelry, and collector tumbled specimens.

Geological facts

Agate and jasper are both forms of chalcedony. When translucent with banding, it is classified as agate; when opaque with mineral inclusions, it is classified as jasper. Tumbled specimens like this one often blend both properties.

Field identification & locations

Identified by its microcrystalline texture, hardness that scratches glass, smooth surface, and distinctive colorful banding or swirls. Commonly found in volcanic regions, ancient river beds, and gravel deposits worldwide, including Brazil, Madagascar, and the western United States.

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