mineral
Kyanite
Kyanite (Al2SiO5)
AI-generated identification · may be incorrectHardness: 4.5 to 7 (anisotropic), Color: Blue, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in one direction, Specific gravity: 3.53 to 3.67
- Hardness
- 4
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Physical properties
Hardness: 4.5 to 7 (anisotropic), Color: Blue, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in one direction, Specific gravity: 3.53 to 3.67
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks at high pressure. Usually found in mica schists and gneisses.
Uses & applications
Used in the manufacturing of refractory materials (ceramics, bricks), abrasive tools, and occasionally as a gemstone for jewelry.
Geological facts
Kyanite is unique because it displays varying hardness depending on the crystal axis: hardness of 4.5 parallel to the length and 7.0 perpendicular to it.
Field identification & locations
Identify in the field by its distinct bladed crystal habit and blue color. Common in metamorphic belts; collectors should look for high-grade metamorphic terrain.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary