Discussion
The sillimanite group minerals used in refractories are
Answer: D
Correct answer: kyanite, andalusite and sillimanite
The three are polymorphs of aluminium silicate with the same composition and different crystal structures, and all three convert to mullite plus silica on firing. They differ in the temperature at which they convert and in how much they expand doing so, which is what decides which is used where - kyanite converting lowest and expanding most.
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