Abstract

Achrematite was described by Mallet (1875) from the Guanacere mine, Chihuahua, Mexico. A cotype specimen of achrematite, obtained from Mallet by Colonel W. A. Roebling and now in the U.S. National Mineral Collection (R6417) was examined in this study. The specimen fits Mallet's description of achrematite very well.

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