Hassina,
Some early work on kornerupine and its stability include:
Seifert F (1975) Boron-free kornerupine: a high pressure phase. Am J Sci 275
57-87
Scheryer W, Abraham K (1976) Natural boron-free kornerupine and its breakdown
products in a sapphirine rock of the Limpopo belt, southern Africa. Contrib
Mineral Petrol 54 109-126
Flemming
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