Kyanite Al2SiO5 - 09.AF.15 (Strunz)(from Minar Gerais, Brazil) Here we have 2 Kyanite’s elon
Kyanite Al2SiO5 - 09.AF.15 (Strunz)(from Minar Gerais, Brazil) Here we have 2 Kyanite’s elongated, columnar crystals, with its characteristic blue. Has a vitreous to pearly luster. This silicate mineral has been used as a semiprecious gemstone and is strongly anisotropic, in that its hardness varies depending on its crystallographic direction (this anisotropism can be considered an identifying characteristic). -- source link
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