The authors try to analyze the geological, physical, and chemical conditions which control precipitation and growth of pegmatite minerals. The growth and persistence of large crystals is attributed as follows: (1) The great chemical complexity of the solutions, which reaches its climax in the last stages of magmatic differentiation; (2) establishment of temperature gradients along the pegmatite thorofares, both from place to place in the thorofares, and from them into the wall rock. The variation in these temperature gradients and in the speed of flow of solutions provides optimum conditions for replacement and crystal growth processes; (3) the tendency of certain crystals in suitable solutions to gain increased stability with increase in size

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