The discovery of the Roy aerolite has been described by H. H. Nininger3 in a recent article. A fragment of the stone, weighing 192.4 grams, and having a specific gravity of 3.39 was received from Mr. Nininger for the petrographic study. A small portion was broken from this piece and a polished surface examined. This polished surface fragment was then made into a thin-section, which, when completed, was 15 by 20 mm. in size.

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