Smoky Quartz
Quartz var. Smoky Quartz · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal, with a typical prismatic or massive habit.
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Forms through igneous and hydrothermal processes, often in pegmatites where natural radiation from surrounding radioactive minerals alters the quartz lattice.
About This Crystal
A polished, tumbled stone displaying translucent brown to greyish-brown coloration with internal cloudy zones and natural inclusions.
Physical Characteristics
Color ranges from light brownish-grey to deep blackish-brown; white streak; conchoidal fracture; specific gravity of approximately 2.65; brittle tenacity.
Optical Properties
Singly refractive or uniaxial positive, with a refractive index of 1.544 to 1.553 and very weak birefringence.
Hardness & Durability
Origin Region
Found globally; notable sources include Brazil, Madagascar, Switzerland, and the United States (Colorado).
Hardness & Durability
Mohs hardness of 7, making it durable and well-suited for everyday jewelry use with no notable cleavage.
Care & Maintenance
Easy to care for; clean with warm soapy water and a soft brush, store away from prolonged direct sunlight to prevent potential color fading.
Rarity & Value
Common and widely available, with very affordable pricing for tumbled stones and standard carved specimens.
Special Characteristics
Coloration is caused by natural gamma irradiation acting on aluminum impurities substituting for silicon within the crystal lattice.
Lore & History
Historically used in Scottish mourning jewelry and ancient Chinese talismans; in modern metaphysical practices, it is traditionally associated with grounding, protection, and the root chakra.