mineral
Purple Agate (Dyed Chalcedony)
SiO2 (Silicon Dioxide) with organic dyes
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: Vivid artificial purple; Luster: Vitreous/Waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Fracture: Conchoidal.
- Hardness
- 6
- Color
- Vivid artificial purple
- Luster
- Vitreous/Waxy
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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.
