Zircon
Zircon (var. White or Colorless) · Precious Gemstone / Collector Mineral
Crystal System
Tetragonal with prismatic or dipyramidal habit; often found as water-worn pebbles in secondary deposits
Mineral Group
Silicates (Subgroup: Nesosilicates)
Chemical Formula
ZrSiO4 (Zirconium Silicate) with trace levels of Hafnium, Rare Earth Elements, or Uranium/Thorium
Formation Process
Primary crystallization from igneous melts; also occurs as accessory minerals in metamorphic rocks and as detrital grains in sedimentary deposits
About This Crystal
A colorless to pale yellow-brown faceted gemstone exhibiting high luster and significant dispersion. It is transparent with a vitreous to sub-adamantine luster and visible doubling of facet junctions
Physical Characteristics
Color: Colorless to whitish; Streak: White; Cleavage: Imperfect; Fracture: Conchoidal to brittle; Specific Gravity: 4.6-4.7; Fluorescence: Often inert or mustard yellow under UV
Optical Properties
Refractive Index: 1.92-1.98 (High); Birefringence: Extremely high (0.059); Dispersion: 0.039 (Fire resembling diamond); Uniaxial Positive; Notable facet doubling
Hardness & Durability
Origin Region
Notably Sri Lanka, Cambodia, Thailand, and Myanmar; typically found in igneous rocks (granite, pegmatite) or alluvial gravels
Hardness & Durability
Mohs Hardness: 6.5 to 7.5; Durability: Brittle with low toughness; Facet edges are prone to 'paper wear' or chipping over time
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners and steam cleaning due to brittleness; store separately to prevent scratching softer stones or chipping
Rarity & Value
Natural white zircon is relatively uncommon; value is primarily driven by clarity, cut, and size. Frequently used as a natural alternative to diamond
Special Characteristics
Extreme birefringence (visible doubling of rear facets when viewed through the table); high dispersion (spectral 'fire'); high density makes it very heavy for its size
Lore & History
Zircon is the oldest mineral on Earth (dating back 4.4 billion years). Historically associated with honor, prosperity, and wisdom; traditionally used as a December birthstone