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.
Identified More mineral →
Explore Blue kyanite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
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.
