mineral
Likely blue-green kyanite crystal
Kyanite, Al₂SiO₅
AI-generated identification · may be incorrectThe small specimen appears blue-green with elongated, bladed crystal faces and a vitreous-to-pearly luster. Kyanite has triclinic crystals and distinctive hardness that varies by direction: about 4.5–5 parallel to length and 6.5–7 across it.
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Physical properties
The small specimen appears blue-green with elongated, bladed crystal faces and a vitreous-to-pearly luster. Kyanite has triclinic crystals and distinctive hardness that varies by direction: about 4.5–5 parallel to length and 6.5–7 across it.
Formation & geological history
Kyanite forms during high-pressure regional metamorphism of aluminum-rich rocks; specimens occur in metamorphic belts of varied geological ages.
Uses & applications
Gem-quality material is cut for jewelry; most kyanite is collected, while some is used in refractory ceramics and kiln products.
Geological facts
Its strongly directional hardness is unusual and helps distinguish it from many blue minerals.
Field identification & locations
Look for flattened, bladed crystals, lengthwise striations, and blue-to-green color; common sources include Brazil, Nepal, India, and the United States. The photo alone does not confirm the identification.
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