mineral
Kyanite
Aluminium Silicate, Al2SiO5
AI-generated identification · may be incorrectMohs hardness varies from 4.5 parallel to the blade length to 6.5 across it. Color is typically blue, but can be white, gray, or green, with a vitreous to pearly luster.
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Physical properties
Mohs hardness varies from 4.5 parallel to the blade length to 6.5 across it. Color is typically blue, but can be white, gray, or green, with a vitreous to pearly luster.
Formation & geological history
Forms in metamorphic rocks primarily through the regional metamorphism of aluminum-rich clay-rich sediments and pelitic schists.
Uses & applications
Used in the manufacture of refractory products, ceramics, and occasionally cut into collector gemstones.
Geological facts
Kyanite is well known for its extreme anisotropy, possessing significantly different hardness depending on the direction the scratch is made.
Field identification & locations
Identify by its distinctive bladed crystal habit, anisotropic hardness, and blue coloration; commonly found in regional metamorphic terrains worldwide.
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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
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous