Two papers published in recent issues of The American Mineralogist (Nagy & Faust, 1956; Kalousek & Muttart, 1957) have dealt with serpentine minerals under the titles “Serpentines: natural mixtures of chrysotile and antigorite” and “Studies on the chrysotile and antigorite components of serpentine” respectively. Certain statements in these papers are at variance with results presented in our paper (Whittaker & Zussman, 1956) and we therefore offer the following comments. Whereas the above two papers classify all serpentine minerals into two categories only, we believe that it is necessary to take account of at least one other serpentine variety whose character is as distinctive as that of chrysotile or antigorite.

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