Kyanite
Kyanite
Kaynite from Judd's Bridge Connecticut
Kaynite
Al2SiO5 (aluminum silicate)
Hardness 6-7
This light blue specimen has elongated tabular crystals. Kyanite is a raw material for the manufacturing of porcelain products. It's used as an electrical insulator and is acid resistant. There is a huge New England deposit. A green opaque crystals is found in Minas Gerais, Brazil. This variety can be faceted as a gem.
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