cor·​di·​er·​ite | \ ˈkȯr-dē-ə-ˌrīt How to pronounce cordierite (audio) \

Definition of cordierite

: a blue mineral of vitreous luster and strong dichroism that consists of a silicate of aluminum, iron, and magnesium

Examples of cordierite in a Sentence

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Multiple translucent crystals fit the bill, namely calcite, cordierite and tourmaline. Steph Yin, New York Times, "The Crystals That May Have Helped Vikings Navigate Northern Seas," 6 Apr. 2018 No calcite, cordierite, or tourmaline crystal has turned up at a Viking archaeological site so far. Kiona N. Smith, Ars Technica, "Mysterious sunstones in medieval Viking texts could really have worked," 6 Apr. 2018 All three types of crystals that the team studied—calcite, a form of calcium carbonate; cordierite, an iron- and magnesium-rich silicate; and tourmaline, a boron-rich silicate—worked well at intervals of 3 hours or less. Sid Perkins, Science | AAAS, "Viking seafarers may have navigated with legendary crystals," 3 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cordierite.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of cordierite

circa 1814, in the meaning defined above

History and Etymology for cordierite

French, from Pierre L. A. Cordier †1861 French geologist

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The first known use of cordierite was circa 1814

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authorized for issue (as a bond)

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