The identification of naturally occurring TiO₂ (B) by structure determination using high-resolution electron microscopy, image simulation, and distance-least-squares refinement

Semicoherently intergrown lamellae of a new TiO₂ mineral have been identified in anatase crystals from Binntal, Valais, Switzerland. This unnamed mineral has been reported previously as the synthetic polymorph TiO₂ (B) (Marchand et al., 1980). We have interpreted high-resolution electron micrographs to determine the positions of columns of Ti cations within the unit cell as determined by electron diffraction. The model structure, which consisted of Ti cations octahedrally coordinated by O, was tested by comparing computer-generated images with experimental micrographs from two orientations. -from Authors