Abstract
The Wadsley defects of pinakiolite related oxyborates (M3O2BO3, M = Mg, Mn, Fe, Al, Sb, Ti) have been studied with high resolution transmission electron microscopy (HREM) and microanalysis (EDX). Structure images of Al-ludwigite crystals show broad slabs of chestermanite with a higher content of antimony. Such chemical variations of structure changes and the nature of local defects support a suggested crystal growth model, including chemical twinning and a crystal growth front parallel to the (100) surface. A new synthetic member of the pinakiolite family, with a twin sequence of regular repeat of ludwigite- and chestermanite-like structures, was identified.
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