A note on the development of large garnets in Sutherland migmatites

The occurrence and origin of garnets about three to four inches across in garnet-mica-hornblende gneiss and garnet amphibolite of the Moine series (Precambrian) in the Borgie area of northern Scotland are discussed. Field evidence indicates the garnets have been concentrated along certain bands or channels by metamorphic and migmatitic processes and now appear as "veins". In an addendum by H. H. Read, comparison is made with the large garnets of the Adirondacks in New York State and the results of S. B. Levin's studies are summarized. It is concluded that similar processes acted in the two areas, but on a smaller scale in Scotland.

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