Abstract
Three different kinds of textures have been found in induced crystal aggregates of CaCO 3 sheaf of wheat morphologies, grown in silica gel at pH = 10. One of them showing concentric banding can be explained by a simple aggregation model of stacked rhombohedra along its c axis. The second does not present concentric banding and is formed by fibers with 3 m symmetry. Finally, the third has a more complicated fiber design with periodical units arranged in a helical pattern, which has not been explained by any simple model of CaCO 3 crystal aggregation. The morphogenetical role of the silicated matrix must be particularly important in this last case.
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