Smoky Quartz
Quartz var. Smoky Quartz (Beta-Quartz) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typically prismatic with pyramidal terminations, though this specimen is fractured/massive
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 with trace Al (aluminum) and natural irradiation
Formation Process
Igneous/Hydrothermal; often forms in pegmatites and hydrothermal veins, darkened by natural radiation exposure from surrounding rock
About This Crystal
Dark brown to nearly black, semi-translucent to opaque specimen. Displays a vitreous luster on fracture surfaces and a slightly greasy, metallic-like sheen on weathered areas.
Physical Characteristics
Color: Smoky brown to black. Streak: White. Cleavage: Indistinct. Fracture: Conchoidal to uneven. Specific Gravity: 2.65. Flourscence: Generally inert.
Optical Properties
Refractive Index: 1.544–1.553. Birefringence: 0.009. Uniaxial positive. Pleochroism: Weak to moderate in brown shades.
Hardness & Durability
Origin Region
Globally distributed; notable sources include Brazil, Switzerland (The Alps), and the United States (Colorado/Pikes Peak)
Hardness & Durability
Mohs Hardness: 7. Toughness: Good (no cleavage planes). Highly stable and suitable for all jewelry types.
Care & Maintenance
Clean with warm soapy water. Resistant to most chemicals, but should be kept away from extreme heat which can cause the color to fade or change.
Rarity & Value
Common. Value is determined by clarity, size, and depth of color. Deeply colored 'Morion' varieties are highly sought after by collectors.
Special Characteristics
Color originates from free silicon atoms created from aluminum-bearing quartz via natural gamma irradiation. This specimen shows iridescent 'oil-slick' surface oxidation or internal fractures.
Lore & History
Historically used in China for early sunglasses in the 12th century. Metaphysically associated with grounding, protection, and neutralizing negative energy.