Soil remineralizers derived from Ca and Mg-rich aluminosilicate rocks (ASiCaMg) contain 9–20% alkaline cation oxides (CaO + MgO + K₂O), with K₂O between 1 and 3%. Basalt is the primary rock used in Brazil, alongside gabbro, amphibolite, andesite, and certain gneisses. Studies show these remineralizers enhance soil fertility by increasing macronutrients (Ca, Mg, P, K) and micronutrients, with effects depending on rock type and soil properties. Basalt powder consistently elevates soil Ca2⁺, Mg2⁺, K⁺, and P levels, even under high crop nutrient uptake. It also raises soil pH, reduces exchangeable Al3⁺, and increases base saturation, improving crop growth and productivity in soybeans, corn, oats, and pastures. Basalt application also contributes to CO₂ sequestration through silicate weathering, with estimated capture rates of 0.6–1.6 Mg CO2 ha−1 yr−1, depending on climate and application rates. High doses (e.g., 50 Mg ha−1) can sequester up to 10.5 Mg CO2 ha−1 over four years. Additionally, replacing limestone with basalt reduces CO2 emissions by up to 78.5 kg CO₂ ha−1 per Mg of applied material, offering dual environmental benefits. While remineralizers enhance soil fertility and crop yields, their effectiveness varies depending on soil type, rock composition, and management practices. Some experimental studies suggest combining remineralizers with microbial inoculants for optimal efficiency. Overall, ASiCaMg remineralizers provide a sustainable approach to enhancing soil health, boosting agricultural productivity, and mitigating climate change through enhanced weathering and reduced liming emissions. This chapter presents the results of several studies conducted by the authors under a single greenhouse experimental protocol that evaluated various ASiCaMg remineralizers to determine their primary effects.