mineral
Kyanite
Al2SiO5
AI-generated identification · may be incorrectHardness varies from 4.5 parallel to the blade length to 6.5 across it. Typically blue, vitreous to pearly luster, and forms tabular, bladed crystals with perfect cleavage.
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Physical properties
Hardness varies from 4.5 parallel to the blade length to 6.5 across it. Typically blue, vitreous to pearly luster, and forms tabular, bladed crystals with perfect cleavage.
Formation & geological history
Forms primarily through regional metamorphism of pelitic aluminum-rich sedimentary rocks in high-pressure environments.
Uses & applications
Used extensively in the manufacture of refractory products, ceramics, and occasionally as a gemstone.
Geological facts
Kyanite is notable for its highly anisotropic hardness, making it dramatically softer in one direction than another.
Field identification & locations
Identified easily by its distinctive blue blades, bladed crystal habits, and extreme hardness differential. Found in Brazil, the USA, and Switzerland.
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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