When transparent enough, cordierite is sometimes used as water sapphires gemstone. Magnesium-cordierite, also called cordierite, iolite or blue silicate mineral,forms as crystals or grains in igneous rocks.It typically occurs in thermally altered clay-rich sediments surrounding an igneous intrusion. It has been found in Tatun, Lanhsu and Lutao, the Lutao is the famous one.


  • Title: Cordierite

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