Blue Quartz
Quartz var. Blue Quartz · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal, massive or microcrystalline habit in tumbled form
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, where the blue color is typically imparted by microscopic inclusions of fibrous minerals like dumortierite, crocidolite, or riebeckite
About This Crystal
A tumbled, smooth pebble of pale to medium grayish-blue quartz with a waxy to vitreous luster, translucent to opaque clarity, and subtle white inclusions or patches scattered throughout
Physical Characteristics
Blue body color with a white streak, conchoidal fracture, no distinct cleavage, specific gravity of approximately 2.65, brittle tenacity, and piezoelectric properties
Optical Properties
Uniaxial positive optical character with a refractive index of 1.544 to 1.553 and low birefringence of 0.009; singly or doubly refractive depending on measurement axis
Hardness & Durability
Origin Region
Brazil, Madagascar, India, and the United States; found in hydrothermal veins and pegmatites
Hardness & Durability
Mohs hardness of 7, good durability, resistant to scratching by most common materials, suitable for general jewelry use with no major cleavage concerns
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid harsh chemicals and prolonged direct sunlight to prevent any potential fading of inclusions, store separately to avoid scratching softer stones
Rarity & Value
Common to uncommon depending on the intensity and natural origin of the blue color; generally very affordable in tumbled forms, widely available on the market
Special Characteristics
Contains microscopic fibrous inclusions that give it its characteristic blue coloration, exhibiting subtle internal cloudiness or mottling
Lore & History
Associated traditionally with calming energy, communication, and the throat chakra, though these represent historical lore and modern crystal healing beliefs rather than scientific properties