Two different crystal structures, isotypic with hexagonal α and orthorhombic β-potassium sulphate, occur in calcium orthosilicate containing small amounts of various additions. This, and the fact that γ-Ca2SiO4 is isotypic with β-Na2BeF4 whose high-tempera-ture, α, form is also isotypic with α-K2SO4, leads to the assumption that calcium orthosilicate, above 1420° C, is isodimorphous with potassium sulphate. It is shown how these relations influence the shape of a schematic equilibrium diagram of the system Ca2SiO4Ca3(PO4)2.

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