Purple Agate (Dyed Chalcedony)

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Vivid artificial purple; Luster: Vitreous/Waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Fracture: Conchoidal.

Formation & Geological History

Formed in cavities of volcanic rocks or ancient lavas. This specific specimen has been chemically dyed purple to enhance its natural banding and aesthetic appeal.

Uses & Applications

Primarily used in jewelry for cabochons, beads, and pendants, as well as for decorative items like coasters and paperweights.

Geological Facts

Natural purple agate is extremely rare; most bright purple specimens on the market are grey or white chalcedony that has been dyed. Large deposits are found in Brazil and Uruguay.

Field Identification & Locations

Identify by looking for concentrations of dye in micro-fractures and a color saturation that appears too uniform or intense to be natural. It is often found in river beds or volcanic outcrops.

Identified on: 4/29/2026

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