gemstone
Blue Zircon
Zircon (Zirconium Silicate - ZrSiO4)
AI-generated identification · may be incorrectHardness: 7.5 (Mohs scale), Color: Vivid blue (heated), Luster: Adamantine to vitreous, Crystal Structure: Tetragonal, Specific Gravity: 4.6-4.7, Cleavage: Indistinct
- Hardness
- 7
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Physical properties
Hardness: 7.5 (Mohs scale), Color: Vivid blue (heated), Luster: Adamantine to vitreous, Crystal Structure: Tetragonal, Specific Gravity: 4.6-4.7, Cleavage: Indistinct
Formation & geological history
Formed as an igneous mineral in pegmatites and granitic rocks. Most blue zircon is produced by heat-treating brownish zircon found in alluvial deposits. Geological age can span billions of years, as zircon is the oldest mineral on Earth.
Uses & applications
Primarily used as a gemstone in jewelry; historically used as a diamond simulant due to high dispersion (fire).
Geological facts
Zircon is known for its high refractive index and double refraction, which can cause a 'doubling' effect of the back facets when viewed through the table. It is the birthstone for December.
Field identification & locations
Identify by its exceptional brilliance and doubling effect of facets. Blue zircon is mostly found in Cambodia, Myanmar, and Sri Lanka. For collectors, it is valued for its 'fire' or dispersion which rivals that of a diamond.
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