mineral

Dyed Blue Agate

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5–7 on Mohs scale; Color: Intense cobalt blue (artificially dyed); Luster: Vitreous/Waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None, conchoidal fracture; Specific Gravity: 2.58–2.64

Hardness: 6
Color: Intense cobalt blue (artificially dyed)
Luster: Vitreous/Waxy

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed as secondary deposits in cavities or vesicles (vugs) of volcanic rocks like basalt. Silica-rich groundwater permeates these holes over millions of years, depositing layers. This specific specimen has been artificially dyed post-extraction.

Uses & applications

Primarily used for decorative purposes, jewelry (pendants/beads), coasters, and lapidary art. Also popular in metaphysical practices and as beginner collector specimens.

Geological facts

Agate is porous, which allows it to absorb colored dyes easily. The intense blue seen here does not occur naturally in this shade; natural blue agate (like Blue Lace Agate) is typically much paler and more lavender in tone.

Field identification & locations

Identify in the field by its distinct concentric banding and waxy texture. To spot a dyed specimen, look for color concentrated in small cracks or along the outer cortex, and a shade of blue that appears 'neon' or unnatural. Common sources include Brazil and Uruguay.