Abstract
SCALY alumina is a hydrous alumina with white iridescent scales, similar to white mica sheets. It was first prepared by Neogi and Mitra as the product of the reaction of aluminium amalgam with aqueous barium nitrate solution1. The conditions for the formation of scaly alumina were re-investigated by Biltz and Lehrer2, who found that a saturated barium nitrate solution, at room temperature, gives the highest yield of well-formed sheets of scaly alumina. Neogi and Mitra gave the composition Al2O3.4H2O for the scaly alumina, but this was not confirmed by Weiser3. Scaly alumina was considered by Weiser to be a form of Wislicenus's fibrous alumina, but this is not true, since fibrous alumina is formed in conditions different from those in Neogi and Mitra's or Biltz and Lehrer's methods4.
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