Abstract

A very complete description of an occurrence of castanite was given in this journal, by Professor A. F. Rogers.1 The material used by Professor Rogers came from Knoxville, California. The original material used by Darapsky2 in establishing the mineral species, came from Sierra Gorda, near Chuquicamata. As stated by Professor Rogers in the introduction to his article, Linck3 states that castanite is undoubtedly a synonym for amarantite (Fe2O3·2SO3·7H2O).

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