White Zircon
Zircon (Natural) · Semi-Precious Gemstone / Collector Mineral
Crystal System
Tetragonal; typically occurs as dipyramidal or short prismatic crystals
Mineral Group
Silicates (Nesosilicates)
Chemical Formula
ZrSiO4 (Zirconium Silicate), often with trace Hafnium, Uranium, and Thorium
Formation Process
Igneous: Forms early in the crystallization of magmas; also occurs in metamorphic rocks and as detrital grains in sedimentary rocks due to its high durability and density.
About This Crystal
This specimen is a colorless (white) faceted gemstone. It exhibits high transparency and a vitreous to sub-adamantine luster. It shows strong light dispersion, contributing to its brilliance and 'fire'.
Physical Characteristics
Color: Colorless; Streak: White; Cleavage: Indistinct in two directions; Fracture: Conchoidal to uneven; Specific Gravity: 4.6–4.7; Fluorescence: Often inert, though some may show yellow or orange under UV.
Optical Properties
Uniaxial positive; Refractive Index: 1.810–1.984; Birefringence: High (0.038–0.059), which causes visible facet-edge doubling; Dispersion: 0.039 (very high fire).
Hardness & Durability
Origin Region
Notable sources include Cambodia (Ratanakiri), Sri Lanka (Matara), Myanmar, Thailand, and Australia. Often found in alluvial deposits.
Hardness & Durability
Mohs Hardness: 6 to 7.5; Toughness: Brittle; Heat sensitive and prone to 'paper wear' (chipping at facet edges) if stored improperly.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic or steam cleaners. Store separately from harder stones like diamonds or sapphires to prevent scratching or chipping.
Rarity & Value
Uncommon; White zircon was historically used as a diamond stimulant. Value depends on size, clarity, and the absence of brown tints. Prices range from $30 to $150 per carat for high-quality specimens.
Special Characteristics
Notable for its extreme birefringence (double refraction) which can be seen under a jeweler's loupe, and its high dispersion which rivals that of a diamond.
Lore & History
Zircon is one of the oldest minerals on Earth, with some grains dated to 4.4 billion years. Historically, white zircons were known as 'Matara Diamonds'. In folklore, it is believed to promote clear thinking and wisdom.