The paper proposes creating a certificate of phosphorite properties, which allows preserving in electronic form experimental temperature dependencies of the material thermal conductivity coefficient at its first heating and in the annealed state, specific true heat capacity at the first and second heating, effective heat capacity at the first heating, relative linear expansion, electrical conductivity and density of phosphate material at heating.There is a developed an information system that can implement such certificate of properties. It allows inputting and storing data on chemical composition and thermophysical and technological properties of samples in digital form, searching and processing them. This system uses client-server technology to access and process data. Calculation of thermophysical properties of phosphorites by structural models takes into account hierarchical properties of phosphorite components, their volume and mass fractions. The information for determining the component proportions is the material mineralogical composition.The information system includes a program for calculating a thermal conductivity coefficient and a specific heat capacity. It differs by taking into account mass and volume fractions of the main rock-forming minerals using interpolation of table temperature values of thermal conductivity coefficients and specific heat capacities of phosphorite, carbonate and silica to determine thermophysical properties of the components at any temperature. The thermal conductivity coefficient of the material is calculated is based on the combined thermal conductivity model taking into account the endothermic reaction of carbonate dissociation; the specific heat capacity is calculated from the additive model.There is a developed algorithm for a program for calculating thermophysical properties by the chemical composition of phosphorites.

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