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Additional recommended knowledge
Researchers recently discovered  that potters in the Hesse region of Germany unknowingly used mullite to create crucibles, enabling alchemists to heat their crucibles to very high temperatures. The formula for making it (using kaolinitic clay and then firing it at temperatures above 1100 degrees) was kept a closely guarded secret.
Mullite is present in the form of acicular crystals in porcelain.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Mullite". A list of authors is available in Wikipedia.|