metamorphic
Titanium Coated Kyanite (Aura Kyanite)
Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating
Hardness: variable 4.5–7.0 on Mohs scale; Color: iridescent peacock (blue, purple, gold); Luster: metallic; Crystal structure: triclinic; Cleavage: perfect in one direction; Specific Gravity: 3.53–3.67
- Hardness
- variable 4
- Color
- iridescent peacock (blue, purple, gold)
- Luster
- metallic
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Physical properties
Hardness: variable 4.5–7.0 on Mohs scale; Color: iridescent peacock (blue, purple, gold); Luster: metallic; Crystal structure: triclinic; Cleavage: perfect in one direction; Specific Gravity: 3.53–3.67
Formation & geological history
Primary mineral Kyanite forms during high-pressure regional metamorphism of clay-rich sedimentary rocks. The iridescent finish is a man-made addition via a process called 'magnetron sputtering' or Physical Vapor Deposition (PVD).
Uses & applications
Primarily used for metaphysical collecting, jewelry (pendants), and laboratory specimens. Natural kyanite is used industrially for high-heat refractory materials like spark plugs and kiln bricks.
Geological facts
Natural kyanite is often called 'Disthene' because of its unique property of having two different hardnesses depending on which direction the crystal is scratched. Aura kyanite is created by bonding titanium and other metal vapors to the crystal surface at high temperatures.
Field identification & locations
Identify by its characteristic bladed, fan-like crystal habit and the thin, oily rainbow sheen. Natural sources include Brazil, Nepal, and the USA (Appalachians), though this specific 'Aura' variety is a commercial product.
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