Carl Tolman in a recent paper on “Quartz Dikes” presents numerous cases from the literature of “quartz masses thought … to be of igneous origin.” Tolman, by the phrase “quartz masses of igneous origin” refers to those masses of quartz which are believed to have formed by crystallization from an igneous melt, and uses it in contrast to “quartz veins” which have formed by deposition from highly aqueous solutions.

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