Alternate Names: Chiastolite
As a member of the alumino-silicate family, it has the same chemistry as sillimanite and kyanite but differs in crystalline structure. Andalusite is volume-stable at elevated temperatures and achieves a slight permanent expansion of about 1.5% at around 2730F. 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.
Andalusite Cross In Rock
Andalusite at Wikipedia
Materials not classifiable as commonly known aluminum silicates. For example, kaolin is a common aluminum silicate.
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.
|Body Thermal Expansion||Volume stable at high temperatures.|