Abstract

No satisfactory data for the morphological determination of the symmetry and elements of graphite have hitherto been published. Goldschmidt (1918), unable to decide between Kenngott's hexagonal interpretation of his meager data and the monoclinic interpretation of Nor-denskjöld, gives both in the Atlas. The former has, however, been accepted by most authors and the mineral has been described as hexago-nal-rhombohedral, the triangular striations commonly to be seen on the base determining its rhombohedral classification. Recent studies of the structure cell by x-ray methods lead to the conclusion that graphite is hexagonal (Bragg, 1937) and not rhombohedral, although a trigonal symmetry class is not excluded.

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