This study investigates the early-stage incongruent dissolution behavior and carbon mineralization potential of mafic rocks representative of potential Swedish subsurface CO₂ storage reservoirs, including a dolerite, a gabbro, and a metabasalt. Batch experiments show that the dolerite exhibits the highest elemental release, followed by the gabbro and metabasalt. Dissolution in dolerite is primarily controlled by olivine and augite, with contributions from labradorite, whereas gabbro dissolution is dominated by augite followed by plagioclase. In the metabasalt, element release reflects contributions from multiple phases, including pyroxene, chlorite, prehnite, and oligoclase, without a single dominant phase. These patterns are consistent with incongruent dissolution during early water-rock interaction. Carbonation experiments indicate the formation of secondary carbon-bearing phases in all samples. Elevated Fe-rich precipitation suggests conditions favorable for Fe-carbonate formation, while thermogravimetric analysis supports the presence of hydrated Mg carbonates as well as Fe- and Ca-bearing carbonates. These results demonstrate favorable dissolution behavior and potential for carbon mineralization, supporting further evaluation of the investigated lithologies. Reactivity is primarily controlled by the availability of reactive primary minerals and the degree of alteration. However, successful implementation also depends on adequate knowledge of subsurface physical conditions, particularly fracture networks and permeability, which are critical for maintaining fluid circulation during injection of CO2 dissolved into the reservoir.