Smoky Quartz
Quartz var. Smoky Quartz · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal, shaped and polished into a freeform tumble or flame shape with a smooth, glossy finish
Mineral Group
Silicates, specifically Tectosilicates
Chemical Formula
SiO2
Formation Process
Hydrothermal and igneous processes where natural irradiation from surrounding radioactive rocks alters the silicon dioxide lattice
About This Crystal
A polished freeform or flame-shaped crystal with a transparent to translucent body showing deep brown to grayish-brown coloration, featuring internal veining, wispy inclusions, and a high-gloss vitreous luster
Physical Characteristics
Brown to black body color, white streak, no cleavage, conchoidal fracture, specific gravity around 2.65, brittle tenacity, piezoelectric, and generally inert under ultraviolet light
Optical Properties
Singly and doubly refractive with a refractive index of 1.544 to 1.553, low birefringence of 0.009, and weak dichroism
Hardness & Durability
Origin Region
Found globally with notable sources in Brazil, Madagascar, the Swiss Alps, and the United States (Colorado)
Hardness & Durability
Mohs hardness of 7, good durability, lacks cleavage making it resistant to breakage, suitable for everyday jewelry wear
Care & Maintenance
Clean with warm soapy water and a soft brush, avoid harsh chemicals, prolonged extreme heat, and excessive direct sunlight to prevent fading
Rarity & Value
Common and widely available, with value determined by clarity, depth of color saturation, and size; generally affordable
Special Characteristics
Contains natural internal cloudiness and phantom-like inclusions common in quartz, colored by natural irradiation centers
Lore & History
Historically used by ancient Scottish and Celtic cultures for weaponry decoration and jewelry, traditionally associated with grounding, protection, and the root chakra in crystal healing lore