The global growth of the ornamental stone industry has led to increased wasteWastes generation, often without proper destination, causing environmental and health issues. A sustainable alternative is using residues like graniteGranite in geopolymerGeopolymer production, due to their high siliconSilicon and aluminumAluminum content and potential to replace traditional cementitious materials, reducing carbon dioxide emissionsEmission. This study aims to evaluate the behavior of geopolymeric pastes, produced with the addition of graniteGranite wasteWastes, in terms of their durability under wetting–drying cycles and firing conditions. The mechanical propertiesMechanical properties and durability of geopolymerGeopolymer mixtures using graniteGranite wasteWastes and metakaolinMetakaolin as precursors were evaluated, with sodium hydroxide (NaOH) used as the activator. Mechanical propertiesMechanical properties were assessed through compressive and flexural strengthStrength tests, with measurements after and before the durability. Preliminary results show that the strengthStrength is higher for mixtures with 10 mol/L NaOH and 20% graniteGranite. Durability tests revealed that mixtures with 8 mol/L are more resistant to cyclic humidity exposure and that compressive strengthCompressive strength of the specimens increased after firing.