Blue Quartzite (Dyed Quartzite)

Hardness: 7 (Mohs scale), Color: Sky blue (artificially dyed), Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.63 - 2.65.

Formed through the metamorphism of quartz-rich sandstone. Under intense heat and pressure, quartz grains recrystallize into a dense, interlocking mosaic of crystals. The blue color in these beads is achieved through a dyeing process, as natural blue quartzite is rare.

Primarily used for costume jewelry, beads, and decorative crafts. In its natural undyed state, quartzite is used in construction as crushed stone, flooring, and wall coverings.

Quartzite is so tough that it often outlasts the surrounding rock in mountainous regions, frequently forming the peaks of ridges. While natural blue variations like Dumortierite exist, the vibrant teal-blue seen here is a result of porosity in the stone allowing for chemical dyes.

Identify by its grainy, sugary texture under magnification and its ability to scratch glass. For collectors, check for concentrated dye in tiny cracks or fissures, which confirms artificial color enhancement. Common in metamorphic belts worldwide.