Blue Kyanite is also called cyanite or kyanite. The name Kyanite is derived from the Greek "this sthénos" (twofold strength, twofold power). This describes a very unusual property of Kyanite: depending on the direction in the crystal, it has two very different hardnesses (so-called hardness anisotropy). Spellings such as distin, disthin or distene have not become established in the retail and wholesale trade.
GPSR
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