Blue Quartz
Quartz var. Blue Quartz · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal, massive or tumbled habit
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2
Formation Process
Hydrothermal or igneous processes, with blue color typically caused by microscopic inclusions of dumortierite, tourmaline, or crocidolite fibers
About This Crystal
A polished, tumbled smooth stone of a distinct grayish-blue or lavender-blue color, showing translucent to opaque properties with a vitreous to waxy luster and minor internal inclusions
Physical Characteristics
Blue body color, white streak, conchoidal fracture, lack of cleavage, specific gravity of approximately 2.65, brittle tenacity
Optical Properties
Singly or doubly refractive with a refractive index of 1.544-1.553, uniaxial positive optical character, weak birefringence
Hardness & Durability
Origin Region
Brazil, India, Madagascar, USA; forms in hydrothermal veins and pegmatites
Hardness & Durability
Mohs hardness of 7, good durability and excellent wearability for jewelry due to absence of cleavage
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid harsh chemicals or prolonged direct sunlight to prevent color fading
Rarity & Value
Common to uncommon, highly affordable as tumbled stones, with value largely depending on saturation and transparency
Special Characteristics
Micro-inclusions giving a uniform blue hue, piezoelectric and pyroelectric properties
Lore & History
Associated traditionally with the throat chakra, enhanced communication, and calming energy, though these are strictly non-scientific beliefs