The Mohr circle for strain provides a rapid, precise, and calculation-free method of predicting angles of exsolution of clinopyroxene or clinoamphibole lamellae from a knowledge of their lattice parameters and those of the host. Agreement between predicted and observed angles indicates that host and lamellae have maintained ‘coherency’ during cooling; disagreement, on the contrary, indicates loss of‘coherency’. As suggested by Dr. P. Robinson and others, this information may become very useful in unravelling the cooling history of these minerals.

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