mineral

Blue Crackle Quartz (Dyed Fire Agate/Quartz)

Silicon Dioxide (SiO2) with artificial dye treatment

Hardness: 7 (Mohs scale), Color: Cobalt blue with white internal fractures, Luster: Vitreous/Glassy, Crystal Structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture.

Identified March 23, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: Cobalt blue with white internal fractures, Luster: Vitreous/Glassy, Crystal Structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed through a heat-treatment and quenching process. Natural quartz or agate is heated to high temperatures and then plunged into cold liquids to create internal 'crackle' fractures, which are subsequently filled with blue dye.

Uses & applications

Used primarily for decorative jewelry, beadwork, meditative 'worry stones', and as low-cost collector specimens for metaphysical enthusiasts.

Geological facts

This is not a naturally occurring color or texture; the 'spiderweb' or crackle effect is an industrial alteration of natural clear quartz or chalcedony to mimic more expensive rare minerals.

Field identification & locations

Identify by looking for the concentration of color within existing cracks, which is a hallmark of dyeing. Natural blue minerals like Lapis or Sodalite will have uniform or naturally mottled colors rather than this 'crack-filled' appearance.

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