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A dichroic violet-blue to gray mineral silicate of magnesium, aluminum, and sometimes iron. Also called dichroite.
[French, after Pierre L. Cordier (1777-1861), French geologist.]
(Minerals) a grey or violet-blue dichroic mineral that consists of magnesium aluminium iron silicate in orthorhombic crystalline form and is found in metamorphic rocks. Formula: (Mg,Fe)2AL4Si5O18.nH2O. Also called: dichroite or iolite
[C19: named after Pierre L. A. Cordier (1777–1861), French geologist who described it]
cor•di•er•ite(ˈkɔr di əˌraɪt)
a strongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks.
[1805–15; after Pierre Latin. A. Cordier (1777–1861), French geologist; see -ite1]
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|Noun||1.||cordierite - a blue mineral of magnesium and iron and aluminum and silicon and oxygen; often used as a gemstone|
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
water sapphire - a deep blue cordierite often used as a gemstone