Blue Quartzite
Blue Metamorphic Quartzite (often containing Dumortierite) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal symmetry; massive/granular habit as a metamorphic rock
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (plus traces of Al, B, Fe, Ti in mineral inclusions)
Formation Process
Metamorphic: Created through high pressure and temperature acting upon quartz-rich sandstone or chert recrystallizing into a dense interlocking matrix
About This Crystal
A tumbled, smooth grayish-blue stone with a waxy to vitreous luster. It exhibits a dense, opaque to translucent appearance with darker blue banding or streaks likely caused by mineral inclusions like Dumortierite.
Physical Characteristics
Color: Sky blue to denim blue; Streak: White; Cleavage: None; Fracture: Conchoidal/Granular; Specific Gravity: 2.62-2.67; Fluorescence: Weak or Inert
Optical Properties
Refractive Index: Approx. 1.544-1.553; Polycrystalline (aggregate) optical character; No pleochroism in massive form; Lacks high dispersion
Hardness & Durability
Origin Region
Brazil (esp. Bahia), South Africa, and India; forms in regional metamorphic environments
Hardness & Durability
Mohs Hardness: 7; Extremely tough and durable due to interlocking crystal structure; Suitable for daily jewelry wear
Care & Maintenance
Wash with warm soapy water; safe for most ultrasonic cleaners; highly resistant to chemical weathering and sunlight fading
Rarity & Value
Common; relatively inexpensive; primarily valued for color saturation and uniformity in tumbled or cabochon form
Special Characteristics
Displays distinct banding and a 'grainy' sugary texture under close inspection; color intensity depends on the concentration of distinct blue mineral inclusions
Lore & History
Historically used as a decorative building material and for small carvings; in modern metaphysical lore, it is believed to promote calm, clear communication, and organizational skills.