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the melt at a high temperature before cooling the melt to the solid. The metastable orthorhombic "O"-form (density 2.72 g/cm³, melting point 562 °C) adopts a layered structure consisting of interconnected P₆O₆ rings, not unlike the structure adopted by certain polysilicates. The stable form is a higher density phase, also orthorhombic, the so-called O' form. It consists of a 3-dimensional framework, density 3.5 g/cm³.

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