mineral

Blue Onyx (Dyed Agate/Chalky Chalcedony)

Silicon Dioxide (SiO2) with artificial pigment

Hardness: 6.5-7 on Mohs scale. Color: Electric blue to teal with banding. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None. Specific Gravity: 2.60-2.65.

Hardness: 6
Color: Electric blue to teal with banding
Luster: Vitreous to waxy

Identified May 29, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Electric blue to teal with banding. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None. Specific Gravity: 2.60-2.65.

Formation & geological history

Formed in cavities of volcanic rocks or ancient lavas. This specimen is post-processed through a dyeing method where porous chalcedony is soaked in chemical solutions to achieve the vibrant blue color.

Uses & applications

Used primarily for ornamental purposes, jewelry (pendants, beads), metaphysical practices, and home decor.

Geological facts

Most 'Blue Onyx' sold in the metaphysical market is actually dyed agate or banded calcite. Real naturally occurring blue chalcedony is much paler and lacks the neon saturation seen in this tumbled stone.

Field identification & locations

Identify by looking for concentrations of blue pigment in tiny cracks or bands. It is commonly found in rock shops and mass-produced in Brazil or India. Check for natural banding beneath the dye.

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