mineral

Dyed Blue Agate

Silicon Dioxide (SiO2) with artificial pigment

Hardness: 6.5-7 (Mohs); Color: Electric blue (artificial); Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.60-2.65

Hardness: 6
Color: Electric blue (artificial)
Luster: Vitreous to waxy

Identified June 22, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Electric blue (artificial); Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.60-2.65

Formation & geological history

Formed as chalcedony deposits in volcanic rock cavities or sedimentary geodes. Natural blue colors are rare; this vivid hue is achieved by soaking porous agate in chemical dyes (often chromium or cobalt salts) and heating them.

Uses & applications

Primarily used for decorative purposes, jewelry (pendants and beads), coasters, bookends, and gift shop curios.

Geological facts

Natural agate is highly porous, which allows it to absorb liquid dyes. The process of coloring agate has been practiced since ancient Roman times, though modern methods allow for the neon colors seen here.

Field identification & locations

Identify by looking for unnatural saturation and color concentrating in micro-fractures. It is commonly found in Brazil as geode slices before processing. Collectors should look for the characteristic banding visible beneath the dye.

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