cordierite
noun
cor·di·er·ite ˈkȯr-dē-ə-ˌrīt 
: a blue mineral of vitreous luster and strong dichroism that consists of a silicate of aluminum, iron, and magnesium
Example Sentences
Recent Examples on the Web The PizzaQue uses a 14-inch cordierite pizza stone and propane gas to make a crispy pizza in six minutes. 
Billy Cadden, Popular Science, 24 May 2018 Multiple translucent crystals fit the bill, namely calcite, cordierite and tourmaline. Steph Yin, New York Times, 6 Apr. 2018 No calcite, cordierite, or tourmaline crystal has turned up at a Viking archaeological site so far. Kiona N. Smith, Ars Technica, 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, 3 Apr. 2018
Billy Cadden, Popular Science, 24 May 2018 Multiple translucent crystals fit the bill, namely calcite, cordierite and tourmaline. Steph Yin, New York Times, 6 Apr. 2018 No calcite, cordierite, or tourmaline crystal has turned up at a Viking archaeological site so far. Kiona N. Smith, Ars Technica, 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, 3 Apr. 2018 Word History
Etymology
French, from Pierre L. A. Cordier †1861 French geologist
First Known Use
circa 1814, in the meaning defined above