metamorphic
Ruby in Kyanite
Corundum (Al2O3) in Kyanite (Al2SiO5)
Hardness: 9 (Ruby)/4-7 (Kyanite); Color: Blue background with pink/red spots; Luster: Vitreous to pearly; Structure: Triclinic/Hexagonal; Cleavage: Perfect in one direction for Kyanite.
- Hardness
- 9 (Ruby)/4-7 (Kyanite)
- Color
- Blue background with pink/red spots
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 9 (Ruby)/4-7 (Kyanite); Color: Blue background with pink/red spots; Luster: Vitreous to pearly; Structure: Triclinic/Hexagonal; Cleavage: Perfect in one direction for Kyanite.
Formation & geological history
Formed during regional metamorphism of aluminum-rich rocks. It is typically found in gneiss or schist formations under high-pressure conditions.
Uses & applications
Used primarily for lapidary work, jewelry (beads, cabochons), and as a popular specimen for mineral collectors and metaphysical practitioners.
Geological facts
Ruby and Kyanite are both aluminum-rich minerals. It is rare to find them together as they usually form at slightly different pressure-temperature ranges; when they do coexist, they create a striking color contrast.
Field identification & locations
Identify in the field by looking for distinct blue bladed crystals associated with red hexagonal or rounded crystalline inclusions. Common locations include India, Brazil, and parts of East Africa.
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