The géosynthèse is art to manufacture at a temperature lower than 100°C of the mineral matter, in an artificial way to obtain all qualities from them (hardness, longevity, stability, etc). It is a question of synthesizing, by the Géochimie, a geological analog , i.e. a material resembling a natural rock and correspondent with a mineralogical classification precise.

For example, the Géopolymère and the mortar S, Cement S, Liant S with reaction geopolymeric are materials geosynthetic.