mineral

Blue Agate (Dyed)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 Mohs; Color: Electric to navy blue (artificial); Luster: Vitreous/Waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (conchoidal fracture)

Hardness: 6
Color: Electric to navy blue (artificial)
Luster: Vitreous/Waxy

Identified May 15, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Electric to navy blue (artificial); Luster: Vitreous/Waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (conchoidal fracture)

Formation & geological history

Formed in volcanic rock cavities or sedimentary rocks through groundwater silica deposition. Natural blue agate exists (Blue Lace Agate), but this vibrant uniform blue is achieved through dyeing translucent chalcedony.

Uses & applications

Primarily used for decorative ornaments, jewelry (beads/pendants), metaphysical healing practices, and as collector specimens for beginners.

Geological facts

Agate has been used by humans for over 3,000 years. Because of its porous nature, it is one of the easiest stones to dye, a practice perfected in Idar-Oberstein, Germany, in the 19th century.

Field identification & locations

Identify by the presence of banding and translucency. In the field, look for nodules with a waxy exterior. If the blue is overly bright and concentrated in cracks, it is likely dyed.