It is concluded that a continuous isomorphous series can be expected between sillimanite and 2/1 mullite. The formation of individual members of this series depends on the temperature and pressure conditions used. At 1 atm pressure the members between 3/2 and 2/1 mullite are stable; 2/1 mullite is not a structurally distinct mineral, so the separate name praguite for it is unnecessary.
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S. Ďurovič (1962) studied this question.
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