Blue bladed kyanite crystal cluster from Brazil with mirror reflection.
Close horizontal view of elongated blue kyanite blades on quartz.
Profile view of blue kyanite blades with a brown crystal.
Macro photograph of blue kyanite prisms embedded in white quartz.
Kyanite video

Kyanite

Kyanite – Al2OSiO4
Elements: Aluminum, Oxygen, Silicon
Class: Silicates – Nesosilicates
Crystal System: Triclinic
Hardness: 5.5-7
Orthoclase
Talc (1)Diamond (10)
Scratches glass. Harder than a steel knife.
Size: 11.9 x 7.1 x 5.1 cm Origin: Barra do Salinas district, Coronel Murta, Minas Gerais – Brazil
Did you know?

Kyanite breaks the rule that a mineral has one hardness. Along the length of a blade it is soft enough to mark with a knife, yet across the same crystal it will scratch steel.

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