Variability of garnet in granites

Abstract
IN extending earlier work on the distribution and significance of manganiferous garnet in the Dartmoor granites, the senior author found it necessary to determine whether the average composition of the Dartmoor species was fairly represented by the single complete analysis (II, below) hitherto available - that of an aggregate of garnet fragments separated from crushed tor-granite. As a preliminary step a similar aggregate from the cordierite-rich granite exposed in the Sweltor quarry was analysed (I).

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