Metamorphic (modified)
Blue Crackle Quartz (Dyed Quarzite)
Silicon Dioxide (SiO2) with artificial dye
Hardness: 7 (Mohs scale), Color: Sky blue with darker blue fractures, Luster: Vitreous (glassy), Crystal structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal fracture, Specific gravity: ~2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Sky blue with darker blue fractures, Luster: Vitreous (glassy), Crystal structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal fracture, Specific gravity: ~2.65
Formation & geological history
Formed from natural quartzite or quartz that has been 'thermal shocked' (heated and rapidly quenched in water) to create internal fractures, which then allow colored dyes to penetrate deep into the stone.
Uses & applications
Used primarily in jewelry making (beads, pendants), decorative home decor, and as 'pocket stones' for crystal healing enthusiasts.
Geological facts
This material is often sold under trade names like 'Blue Fire Agate' or 'Blue Crackle Agate', but it is scientifically a dyed quartz. The distinctive 'shattered' look is man-made and does not occur naturally in this vibrant blue color.
Field identification & locations
Identify by looking for the concentration of dye within the cracks (veining is darker than the rest of the stone). It is commonly found in novelty shops and craft stores globally.
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