Recent Examples of cordierite from the Web
Multiple translucent crystals fit the bill, namely calcite, cordierite and tourmaline.
No calcite, cordierite, or tourmaline crystal has turned up at a Viking archaeological site so far.
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.
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Britannica.com: Encyclopedia article about cordierite
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