Smoky Quartz (with Metallic Inclusions)
Quartz var. Smoky Quartz · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; typically hexangular prismatic with pyramidal terminations, though shown here in a massive, fractured habit.
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
SiO2 (Silicon Dioxide) with natural irradiation of aluminum impurities; may contain Fe or Pyrite inclusions
Formation Process
Igneous/Hydrothermal: Forms through the crystallization of silica-rich fluids; the smoky color is induced by natural gamma radiation interacting with aluminum trace elements.
About This Crystal
Translucent to semi-opaque smoky brown to dark grey base with a vitreous to greasy luster. The surface shows uneven fracture and contains yellow-gold metallic inclusions and lighter feldspar-like patches.
Physical Characteristics
Color: Smoky brown/grey; Streak: White; Cleavage: None (indistinct); Fracture: Conchoidal to uneven; Specific Gravity: 2.65; Fluorescence: Often inert, occasionally weak green/yellow.
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: +0.009; Pleochroism: Weak to moderate (varying shades of brown); Uniaxial positive.
Hardness & Durability
Origin Region
Brazil, Switzerland, Madagascar, and USA (Colorado/New Hampshire); typically found in pegmatites and alpine veins.
Hardness & Durability
Mohs Hardness: 7; Toughness: Good (brittle); Highly stable for jewelry use; resistant to most household chemicals except hydrofluoric acid.
Care & Maintenance
Wash with warm soapy water and a soft brush; avoid ultrasonic cleaners if inclusions are present. Store away from direct sunlight to prevent potential color fading over long periods.
Rarity & Value
Common; Value is determined by transparency and size. Inclusions like the ones visible can increase collector interest but may lower gemstone clarity value.
Special Characteristics
Exhibits phantom growth patterns occasionally; contains possible metallic sulfide inclusions (like Pyrite or Chalcopyrite) creating the yellowish metallic luster visible on the surface.
Lore & History
Historically used in 12th century China for the first 'sunglasses'. Metaphysically associated with the Root Chakra and used traditionally for grounding and neutralizing negative energy.