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Kyanite: Al2SiO5 = Al[6]Al[6]OSiO4
Comments: Cluster of 4, green, gemmy, fluorescent blades of kyanite. Location: Pech, Afghanistan. Scale: 1.7 x 1.0 x 0.3 cm. © Kieth Hayes
Comments: Two terminated, bright blue crystals of kyanite in a white quartz matrix. Location: Barra do Salinas, Minas Gerais, Brazil. Scale: 9.5 x 4 x 4 cm. © Isaias Casanova / IC Minerals