Abstract
The naturally occurring olivine-type minerals form a wide range of solid solutions. Their crystal structure is characterized by isolated SiO4 tetrahedra and two octahedral cation sites. The structure is orthorhombic and various descriptions use different settings of class mmm. We have chosen Pnma throughout our study. The cations occupy two fourfold positions; M1 (Wyckoff symbol 4a) has local symmetry ī, whereas M2 (4c) is characterized by a mirror plane m. The crystal structure is sketched in Fig. 1.
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