Abstract
This study deals with optical properties of the anisotropic C 3A-form. With an increase in SiO 2 or Fe 2O 3 in the orthorhombic form of C 3A dispersion formula varies from v > r to v < r with different optic planes (010 and 100 respectively), so that for a certain intermediate content the optic planes for colors at the extremes of the visible spectrum are crossed. In the case of the monoclinic phase dispersion takes place by a rotation of the optic plane around the acute bisectrix X(= c). The characteristic abnormal interference color of the anisotropic C 3A can be explained by these various types of dispersion.
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