mineral
Kyanite
Aluminum Silicate, Al2SiO5
AI-generated identification · may be incorrectHardness varies drastically from 4.5 parallel to the blade to 6.5 across; color is typically blue, white, or gray; vitreous to pearly luster with triclinic crystal system.
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Physical properties
Hardness varies drastically from 4.5 parallel to the blade to 6.5 across; color is typically blue, white, or gray; vitreous to pearly luster with triclinic crystal system.
Formation & geological history
Formed through the regional metamorphism of pelitic rocks rich in aluminum, typically within high-pressure, moderate-temperature tectonic environments.
Uses & applications
Used primarily in the manufacture of refractory products, ceramics, porcelain plumbing fixtures, and occasionally as a gemstone in jewelry.
Geological facts
Kyanite is one of the few minerals with strongly anisotropic hardness, making it physically distinct in directional durability. It is commonly used as an index mineral to determine metamorphic pressure-temperature paths.
Field identification & locations
Identified easily by its distinctive bladed crystal habit, anisotropic hardness, and prominent blue coloration. Found globally in metamorphic schists and gneisses.
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
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