metamorphic
Blue Quartzite (Dyed)
Silicon Dioxide (SiO2) with inclusions
Hardness: 7 on Mohs scale; Color: Electric blue (due to dye), naturally grayish; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline/trigonal); Specific gravity: 2.63-2.65.
- Hardness
- 7 on Mohs scale
- Color
- Electric blue (due to dye), naturally grayish
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Electric blue (due to dye), naturally grayish; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline/trigonal); Specific gravity: 2.63-2.65.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, causing recrystallization. The vibrant blue color in this specimen is achieved through an artificial dyeing process common in commercial lapidary.
Uses & applications
Mainly used for decorative purposes, such as tumbled stones, ornamental carvings, beads for jewelry, and as aquarium gravel or landscaping accents.
Geological facts
Natural blue quartzite exists but is rare and usually owes its color to mineral inclusions like dumortierite or magnesioriebeckite. This specific tumbled stone is a dyed variety meant to mimic more expensive blue minerals.
Field identification & locations
Identify by its grainy, sugary texture under the surface and common 'crackle' patterns where dye has concentrated in fractures. Found globally where metamorphic belts exist, such as Brazil, India, and the USA.
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