A technique is described for the application of transmission electron microscopy to petrographic investigations. Polished and etched thin sections are the basis for acetate peels which are replicated for electron microscopy by the two-stage (acetate peel—carbon film) method. Photomicrographs are made of the acetate peel and of the mounted carbon film replica. In addition, lettered ‘finder’ grids (specimen holders) are used as replica mounts. This system makes possible nearly continuous visual correlation between observations of the thin section by polarizing microscopy and observations of the carbon film replica by electron microscopy. The observer may thus bring both optical criteria and high resolving power to bear on the same object (e.g., a single crystal or a textural pattern). The stages of increased resolution and detail obtained with this technique are illustrated for a vitric clast in lunar sample 12073 and for a zeolitized glass shard from an ash-fiow tuff.

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