mineral
Blue kyanite
Kyanite (Al₂SiO₅)
AI-generated identification · may be incorrectTypically vivid blue with vitreous luster and bladed crystals; triclinic structure, Mohs hardness about 4.5–5 parallel to blades and 6.5–7 across them. The image appears to show blue crystal material on a darker matrix; cleavage and composition cannot be confirmed from the photo.
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Physical properties
Typically vivid blue with vitreous luster and bladed crystals; triclinic structure, Mohs hardness about 4.5–5 parallel to blades and 6.5–7 across them. The image appears to show blue crystal material on a darker matrix; cleavage and composition cannot be confirmed from the photo.
Formation & geological history
Forms mainly during regional metamorphism of aluminous sediments, commonly in schist and gneiss; deposits span many geological ages.
Uses & applications
Used in refractory ceramics and heat-resistant products; attractive crystals are collected and occasionally cut as gemstones.
Geological facts
Kyanite’s hardness varies by direction, an unusual property that makes cutting and identification distinctive.
Field identification & locations
Look for elongated blue blades with pronounced lengthwise striations and strongly directional hardness; common sources include Brazil, Nepal, India, and the United States. The specimen’s exact identity is uncertain from the image alone.
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Gneiss or Schist
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Metamorphic
Sandstone (with potential mineral staining/concretions)
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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Septarian Pebble
Septarian nodule / Concretion
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