| Monthly Tech-Tip | No tracking! No ads! No paywall! |
Andalusite
Alternate Names: Chiastolite
| Oxide | Analysis | Formula | Tolerance |
|---|---|---|---|
| Al2O3 | 62.90% | 1.00 | |
| SiO2 | 37.10% | 1.00 | |
| Oxide Weight | 162.16 | ||
| Formula Weight | 162.16 | ||
Notes
As a member of the alumino-silicate Al₂SiO₅ minerals (the polymorphs are kyanite, andalusite, sillimanite). Andalusite has a less densely packed crystal structure than kyanite. It usually begins converting to mullite a little higher than kyanite and does so more gradually. It is thus more volume-stable and (achieving a slight permanent expansion of about 3-5% at around 2730F). Andalusite is often preferred in refractory production because it creates less firing stress, conversion is more controlled and dimensional stability is easier to predict
The andalusite deposit in Hillsboro, NC is very clean with low iron and alkali impurities.
The Pyrofrac series of andalusite phyrophyllite materials are beneficeated to maximize the available andalusite.
Related Information
This picture has its own page with more detail, click here to see it.
Andalusite Cross In Rock
Links
| URLs |
http://en.wikipedia.org/wiki/Andalusite
Andalusite at Wikipedia |
| Materials |
Pyrophyllite
A refractory aluminum silicate mineral often used in clay body recipes to lower thermal expansion, control fired maturity, mullite development catalyst, etc. |
| Materials |
Andafrac
|
| Materials |
Pyrofrac 0204
|
| Materials |
Pyrofrac 0304
|
| Materials |
Pyrofrac 1004
|
| Materials |
Pyrofrac 1655
|
| Materials |
Pyrofrac 1855
|
| Materials |
Pyrofrac 2023
|
| Materials |
Pyrofrac 2024
|
| Materials |
Pyrofrac 2034
|
| Materials |
Pyrofrac 4203
|
| Materials |
Pyrofrac 4205
|
| Materials |
Kyanite
A refractory aluminum silicate mineral notable for low thermal expansion and one-way volume expansion as it converts to mullite at high temperatures. |
| Materials |
Alkatrol
|
| Materials |
Pyrofrac
|
| Materials |
Seriphyl
|
| Materials |
Sillimanite
A low expansion aluminum silicate mineral that converts to mullite on repeated firings. |
| Typecodes |
Aluminum Silicate
Materials not classifiable as commonly known aluminum silicates. For example, kaolin is a common aluminum silicate. |
| Typecodes |
Low Expansion Material
Materials used to make bodies requiring low expansion (e.g. flameware, refractories). The individual particles of these materials have low expansion. Some of theme even expand at certain temperature ranges. |
| Minerals |
Andalusite
A low expansion alumina silicate mineral. |
Mechanisms
| Body Thermal Expansion | Volume stable at high temperatures. |
|---|
| By Tony Hansen Follow me on        |  |
Got a Question?
Buy me a coffee and we can talk 
https://digitalfire.com, All Rights Reserved
Privacy Policy