The present invention relates to a composite material to be used in sunscreen applications, for example in cosmetic powders, in cosmetic compositions or sunscreen compositions. The composite material comprises crystalline UV-ab sorbing semiconductor particles incorporated within a matrix of highly porous amorphous mesoporous magnesium carbonate (MMC). The composite material has similar properties with regards to the morphology and the mesoporous structure as a MMC without incorporated UV-ab sorbing semiconductor particles. The MMC matrix does not impair the UV-blocking properties of the crystalline semiconductor particles but decrease their photocatalytic activity.
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