mineral
Kyanite
Al2SiO5
AI-generated identification · may be incorrectHardness varies from 4.5 parallel to the blade to 6.5 across. Colors are typically blue, gray, or green with a vitreous to pearly luster and triclinic crystal system.
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Physical properties
Hardness varies from 4.5 parallel to the blade to 6.5 across. Colors are typically blue, gray, or green with a vitreous to pearly luster and triclinic crystal system.
Formation & geological history
Formed through the high-pressure metamorphism of pelitic rocks in regional metamorphic environments.
Uses & applications
Used primarily in the manufacture of refractory products, ceramics, and occasionally as a gemstone.
Geological facts
Kyanite is well known for its pronounced anisotropic hardness, making it softer when scratched lengthwise than across.
Field identification & locations
Identified easily by its bladed crystal habit, distinct cleavage, and variable hardness; found worldwide in metamorphic schists and gneisses.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
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