Abstract
The study of polished sections and powder photographs has confirmed earlier observations on the occurrence of maghemite γ-Fe2O3) in the laterites and ferricretes of the Sydney district, New South Wales. The mineral is confined to the black cores of some pisolites and to similar materials in ferricretes. In profile, the amount of maghemite tends to decrease from top to bottom, being confined mainly to the topmost parts (i.e. the upper-indurated zone). The mineral may have been derived from the magnetite in the Hawkes-bury Sandstone and or from siderite in the Wianamatta Shales and basic igneous rocks.
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