Mullite

Mullite or porcelainite is a rare silicate mineral of post-clay genesis. It can form two stoichiometric forms 3Al2O32SiO2 or 2Al2O3 SiO2. Unusually, mullite has no charge balancing cations present. As a result, there are three different Al sites: two distorted tetrahedral Al sites and one Al other site which adopts a higher co-ordinate octahedral ...
Found on http://en.wikipedia.org/wiki/Mullite

Mullite

Aluminum silicate
Found on http://www.translationdirectory.com/glossaries/glossary075.htm

mullite

any of a type of rare mineral consisting of aluminum silicate (3Al2O32SiO2). It is formed upon firing aluminosilicate raw materials and is the most ... [2 related articles]
Found on http://www.britannica.com/eb/a-z/m/136
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