Cordieria is of vitreous lustre to matte and is of blue color; but with a blue, yellow, violet trichroism. It has an irregular, subconchoidal conchoidal fracture.
Also known as Iolite
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Cordierite
- Translations : Cordierite, Cordieriet, Kordieriitti, 菫青石, Kordieryt, Кордиерит, Cerasita, Cordierita,קורדיאריט, کوردیریت,
- Synonym : Dichroite, Jolite, Luchsapphir, Esmarkite, Tanolite, Iolite
- Etymology : Cordierite is dedicated to the French geologist and mineralogist Louis Cordier, who first described it as dichroit.
- Discovery: 1813 by Lucas
- Type localityBodenmais, Bavaria, Germany.
Gemological data
- Chemical formula : (Mg,Fe)2Al3(AlSi5O18)
- Hardness (Mohs) : 7 - 7.5
- Density : 2.6 -2.66
- Refractive index : nα = 1.527 - 1.560 nβ = 1.532 - 1.574 nγ = 1.538 - 1.578
- Birefingence : 0,011-0,018
- Crystal system : Orthorhombic
- Group : Silicates
- Mineralogical Class : Tectosilicates
