mullite

mullite
/mul"uyt/, n.
a rare clay mineral, aluminum silicate, Al6Si2O13, produced artificially during various melting and firing processes: used as a refractory. Also called porcelainite.
[1924; after MULL, source of the rocks in which it was first identified; see -ITE1]

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      any of a type of rare mineral consisting of aluminum silicate (3Al2O3·2SiO2). It is formed upon firing aluminosilicate raw materials and is the most important constituent of ceramic whiteware, porcelains, and high-temperature insulating and refractory materials. Compositions, such as mullite, having an alumina-silica ratio of at least 3:2 will not melt below 1,810° C (3,290° F), whereas those with a lower ratio partially melt at temperatures as low as 1,545° C (2,813° F).

      Natural mullite (Mull) was discovered as white, elongated crystals on the Island of Mull, Inner Hebrides, Scot. It has been recognized only in fused argillaceous (clayey) enclosures in intrusive igneous rocks, a circumstance that suggests very high temperatures of formation. For mineralogic properties, see silicate mineral (table).

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Look at other dictionaries:

  • Mullite — General Category Silicate mineral Chemical formula Al6Si2O13 Strunz classification 9.AF.20 Crystal symmetry …   Wikipedia

  • mullite — ● mullite nom féminin (de Mull, nom propre) Silicate naturel d aluminium …   Encyclopédie Universelle

  • mullite — [mul′īt΄] n. [after Mull, island off W coast of Scotland, where the ore is found + ITE1] a light colored, very hard, orthorhombic mineral, Al6Si2O13, that is resistant to heat and corrosion, used to make glass, furnace linings, etc …   English World dictionary

  • Mullite — La mullite est un aluminosilicate. Ce cristal est un composé stœchiométrique d oxyde d aluminium (III) et d oxyde de silicium (IV) dont la composition est : 3Al2O3,2SiO2 soit en masse, 72% d oxyde d aluminium et 28% d oxyde de silicium. La… …   Wikipédia en Français

  • mullite — noun Etymology: Mull, island of the Inner Hebrides Date: 1924 a mineral that is an orthorhombic silicate of aluminum which is resistant to corrosion and heat and is used as a refractory …   New Collegiate Dictionary

  • mullite — Смотри Муллит …   Энциклопедический словарь по металлургии

  • mullite — mull·ite …   English syllables

  • mullite — ˈməˌlīt noun ( s) Etymology: Mull, island off the west coast of Scotland + English ite : a mineral Al6Si2O13 consisting of a silicate of aluminum that is orthorhombic in form and resistant to corrosion and heat and is found naturally and also… …   Useful english dictionary

  • Муллит — [mullite] минерал силикат алюминия ЗАl2O3. • 2SiO2 (71,8 % Аl2O3, 28,2 % SiO2); в природе встречается редко, синтезируется обжигом или плавлением, кристаллизируется в ромбической системе, γ = 3,1 г/см3, твердость 6 7, tпл = 1910 °С. При избытке… …   Энциклопедический словарь по металлургии

  • Mullit — Weißer, faseriger Mullit vor dicktafeligem Osumilith (Bildgröße: 1,5 mm) Fundort: Wannenköpfe, Ochtendung, Eifel, Deutschland Chemische Formel …   Deutsch Wikipedia

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