mineral
Kyanite
Al2SiO5
AI-generated identification · may be incorrectHardness: 4.5-5 along length, 6.5-7 across width (Mohs), Color: Blue, white, gray, green, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions
- Hardness
- 4
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Physical properties
Hardness: 4.5-5 along length, 6.5-7 across width (Mohs), Color: Blue, white, gray, green, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions
Formation & geological history
Forms during regional metamorphism of clay-rich sediments, primarily in schists and gneisses
Uses & applications
Used in the manufacture of refractory materials, ceramics, and occasionally as a gemstone or for collecting
Geological facts
Kyanite is strongly anisotropic, meaning highly variable hardness depending on the direction it is scratched.
Field identification & locations
Identified by its bladed crystals, blue color, and distinct hardness variations. Found in areas like Brazil, USA, Switzerland, and India.
More like this
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