Sillimanite is an alumino-silicate mineral with the chemical formula Al2SiO5. It is one of the three allotropic varieties of mineral corresponding to the formula Al2O3 SiO2. The other two are an adalusite and kyanite. They all contain 63.2% Al2O3 and 36.8% SiO2. They are distinguished from one another by their modes of occurrence and physical and optical properties.
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