Chemically distinct intergrowths observed by HRTEM

The crystal structures of many minerals can be visualized as ordered intergrowths of two or more structurally distinct planar units. Thompson 

Over the past decade. HRTEM has made its greatest contributions to the understanding of this class of planar defea a review of this work as applied to silicate minerals is given by Veblen (1985b). The studies of 

HRTEM has been applied to a very large number of minerals some examples recently studied include carlosturanite (Mellini, Ferraris, and Compagnoni 1985), orientite (Mellini, Merlino, and Pasero 1986), zinke-nite (Smith 1986), eastonite (Livi and Veblen 1987), andalusite (Ahn, Burt, and Buseck 1988), biotites and muscovites (Konings et al. 1988), and sap-phirine (Christy and Putnis 1988). 

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