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Andalusite
Andalusite is an alumino-silicate mineral with the chemical formula Al2SiO5.
Andalusite is a common metamorphic mineral which forms under high pressure and/or temperature. The minerals kyanite and sillimanite are polymorphs of andalusite, each occurring under different temperature-pressure regimes and are therefore rarely found together in the same rock. Because of this the three minerals are a useful tool to help identify the pressure-temperature paths of the host rock in which they are found.
- Kyanite
- Sillimanite
- Chiastolite[?]
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