metamorphic
Blue Quartzite (likely dyed)
Silicon dioxide (SiO2) with likely color treatment
Hardness: 7 on Mohs scale; Color: Intense blue; Luster: Vitreous to waxy (tumbled); Crystal Structure: Hexagonal (microcrystalline); Cleavage: None
- Hardness
- 7 on Mohs scale
- Color
- Intense blue
- Luster
- Vitreous to waxy (tumbled)
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Physical properties
Hardness: 7 on Mohs scale; Color: Intense blue; Luster: Vitreous to waxy (tumbled); Crystal Structure: Hexagonal (microcrystalline); Cleavage: None
Formation & geological history
Formed through the metamorphism of quartz sandstone under high heat and pressure, typically in orogenic belts. Many brightly colored blue specimens in the hobby trade are tumbled quartzite that has been dyed.
Uses & applications
Used primarily for decorative purposes, ornamental stones, jewelry making (beads and cabochons), and as 'pocket stones' in the metaphysical community.
Geological facts
Natural blue quartzite (containing dumortierite inclusions) does exist, but vibrant, translucent blue tumbled stones like this are frequently produced by boiling quartzite in dye solutions to fill micro-fractures.
Field identification & locations
Identify by its grainy, sugary texture visible under the surface (unlike smooth glass) and its high hardness. Natural blue versions are found in Brazil and South Africa.
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