Smoky Quartz
Quartz var. Smoky Quartz · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal system, typically faceted into a standard cut pendulum habit with a hexagonal prismatic body and pyramidal termination.
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2
Formation Process
Hydrothermal and magmatic processes, where natural irradiation from surrounding radioactive rocks alters the silicon dioxide lattice.
About This Crystal
A translucent to transparent faceted pendulum pendant displaying a brown to grayish-brown body color. It features internal cloud-like inclusions and fractures, exhibiting a vitreous luster.
Physical Characteristics
Brown to grayish-black body color, white streak, conchoidal fracture, distinct lack of cleavage, specific gravity of approximately 2.65, brittle tenacity.
Optical Properties
Uniaxial positive, refractive index of 1.544-1.553, birefringence of 0.009, doubly refractive.
Hardness & Durability
Origin Region
Found globally with notable sources in Brazil, Madagascar, the United States (Colorado), and Switzerland. Forms in pegmatites and hydrothermal veins.
Hardness & Durability
Mohs hardness of 7, good durability, suitable for daily wear in jewelry despite lacking cleavage planes.
Care & Maintenance
Clean with warm soapy water using a soft brush. Avoid harsh chemicals, ultrasonic cleaners, and prolonged exposure to direct sunlight to prevent color fading.
Rarity & Value
Common and widely available. Value depends on color depth, clarity, and cut. Typically inexpensive unless featuring rare locality tags or unique inclusions.
Special Characteristics
Piezoelectric and pyroelectric properties. Natural coloration is caused by irradiation affecting aluminum impurities within the crystal lattice.
Lore & History
Historically used in Scottish mourning jewelry and as protective amulets in various ancient cultures. Associated with the Root Chakra, believed to ground energy, relieve stress, and absorb negative vibrations.