In discussing the subject of the origin of pegmatites you remember the controversy that raged sometime ago as to whether they were dikes or veins, the essential difference being that dikes are igneous in origin whereas veins were formed by the aid of circulating waters. A compromise was offered suggesting that the material from which they were formed was in an aqueo-igneous condition. But all these ideas postulated a single period of formation. I would like to offer for your consideration another explanation for the formation of pegmatites.

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