The largest specimen of monazite thus far known was recently described by Schaller.2 Through his kindness, portions of less perfect crystals accompanying the type specimen were given the writer for study. The mineral is reasonably fresh and unaltered in appearance, and the accompanying radiograph, Fig. 1, indicates a generally uniform distribution of radioactive material. The very low uranium content shown in the analyses is also to be taken as evidence that the degree of alteration is slight, according to Fenner.3

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