metamorphic
Ruby in Kyanite
Corundum in Disthene (Al2SiO5 + Al2O3)
Hardness: 4-7 for Kyanite, 9 for Ruby; Color: blue background with pink/red spots; Luster: Vitreous to pearly; Crystal structure: Triclinic and Hexagonal.
- Hardness
- 4-7 for Kyanite, 9 for Ruby
- Color
- blue background with pink/red spots
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 4-7 for Kyanite, 9 for Ruby; Color: blue background with pink/red spots; Luster: Vitreous to pearly; Crystal structure: Triclinic and Hexagonal.
Formation & geological history
Formed under high-pressure regional metamorphism of aluminum-rich sedimentary rocks (pelites). Common in metamorphic belts such as the Himalayas or Appalachian mountains.
Uses & applications
Used primarily as a decorative specimen for collectors, in metaphysical practices, and occasionally carved into cabochons for jewelry.
Geological facts
This specimen is unique because it combines two aluminum silicate minerals that form under specific high-pressure conditions. The ruby (red corundum) is often surrounded by a reaction rim of other minerals.
Field identification & locations
Identify by the distinct contrast of red ruby hexagonal crystals embedded in a bladed blue kyanite matrix. Often found in India, Tanzania, and Russia. Look for the blue color and bladed habit of kyanite.
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