Difference between revisions of "Mullite"
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== Description == | == Description == | ||
| − | A stable crystalline form of aluminum silicate. Mullite is formed by heating aluminum silicate compounds, such as cyanite, sillimanite and andalusite, to high temperatures. It begins forming at 1000 C and the conversion is nearly complete by 1340 C. Mullite has needle-shaped crystals which provide a felting effect for strengthening stoneware and porcelain (Fournier 1996). | + | A stable crystalline form of [[aluminum silicate]]. Mullite is formed by heating aluminum silicate compounds, such as cyanite, [[sillimanite]] and [[andalusite]], to high temperatures. It begins forming at 1000 C and the conversion is nearly complete by 1340 C. Mullite has needle-shaped crystals which provide a felting effect for strengthening stoneware and porcelain (Fournier 1996). |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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none; Mullit (Deut.); mulliet (Ned.) | none; Mullit (Deut.); mulliet (Ned.) | ||
| − | == | + | == Physical and Chemical Properties == |
| − | Insoluble in water. | + | * Insoluble in water. |
| − | + | * Orthorhombic system with needle-shaped crystals. | |
| − | Orthorhombic system with needle-shaped crystals. Good cleavage in one direction | + | * Good cleavage in one direction |
{| class="wikitable" | {| class="wikitable" | ||
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|- | |- | ||
! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | 1810 | + | | 1810 C |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 3.15 | + | | 3.15 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| Line 28: | Line 28: | ||
|} | |} | ||
| − | == | + | ==Resources and Citations== |
| − | R. Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Co., Radnor, PA, 1996. | + | * R. Fournier, ''Illustrated Dictionary of Practical Pottery'', Chilton Book Co., Radnor, PA, 1996. |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 14:49, 1 October 2022
Description
A stable crystalline form of Aluminum silicate. Mullite is formed by heating aluminum silicate compounds, such as cyanite, Sillimanite and Andalusite, to high temperatures. It begins forming at 1000 C and the conversion is nearly complete by 1340 C. Mullite has needle-shaped crystals which provide a felting effect for strengthening stoneware and porcelain (Fournier 1996).
Synonyms and Related Terms
none; Mullit (Deut.); mulliet (Ned.)
Physical and Chemical Properties
- Insoluble in water.
- Orthorhombic system with needle-shaped crystals.
- Good cleavage in one direction
| Composition | 3Al2O3 - 2SiO2 |
|---|---|
| Melting Point | 1810 C |
| Density | 3.15 g/ml |
| Refractive Index | 1.642 -1.679 |
Resources and Citations
- R. Fournier, Illustrated Dictionary of Practical Pottery, Chilton Book Co., Radnor, PA, 1996.