Smoky Quartz (with Druzy)
Quartz var. Smoky · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal (Hexagonal), typically prismatic with pyramidal terminations; often found in massive form or as druzy coatings within cavities
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2 (Silicon Dioxide) with natural irradiation causing color centers
Formation Process
Hydrothermal or Igneous; forms as silica-rich fluids cool in cavities or through crystallization in pegmatites under varying temperature and pressure
About This Crystal
The specimen shows a rocky, host-rock matrix with microcrystalline druzy quartz. It features a greyish to smoky brownish hue, translucent in small crystals, with a vitreous to sub-vitreous luster and a sparkling, 'sugar-like' surface texture.
Physical Characteristics
Color: Smoky grey to brownish-grey; Streak: White; Cleavage: Indistinct/None; Fracture: Conchoidal; SG: 2.65; Fluorescence: Usually none; Tenacity: Brittle
Optical Properties
Refractive Index: 1.544-1.553; Birefringence: 0.009; No pleochroism visible in druzy form; Uniaxial positive
Hardness & Durability
Origin Region
Brazil, Switzerland (Alps), Colorado (USA), and Scotland; typically found in granitic pegmatites and hydrothermal veins
Hardness & Durability
Mohs Hardness: 7.0; High durability and stability for jewelry, though thin druzy coatings can be fragile to physical abrasion
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals; safe in most ultrasonic cleaners; avoid extreme thermal shock
Rarity & Value
Common; Value is determined by the size of the cluster, clarity of individual crystals, and aesthetic appeal of the host matrix; usually inexpensive
Special Characteristics
Sparkling druzy effect; natural smoky coloration caused by aluminum impurities combined with natural gamma radiation from surrounding rocks
Lore & History
Smoky Quartz was used in Scotland for 'Cairngorm' jewelry and in ancient China for snuff bottles; traditionally believed to be a 'grounding' stone in crystal healing lore.