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S <br />• 2. Carbonate Minerals - reactive dissolution <br /> CaC03(5) + C02(g) + H2O f Caz+ + 2HCO3 (3) <br /> calcite <br /> or CaC03(s) + HC03 + H+ F Ca2+ + 2HCO3 (4) <br /> In this case, reactants in the weathering came from <br /> the water or air. <br /> 3. Quartz - reactive dissolution <br /> Si02(s) + 2H2O H4Si04(aq) (S} <br /> quartz <br /> Si02(s) + H2O + 0H f H3SiO4 (6) <br /> B. Incongruent Reaction - solid residues are deposited as <br /> products <br />• 1. Simple silicates - congruent or incongruent <br /> Mg2Si04 (s) + 4CO2 (g) + 2HzO - 2Mg2+ + 4HC03 + <br />H4Si04(aq) (7) <br />Mg-olivine <br />or + _ <br />Mg2SiO4(s) + 4CO2(g) + 2H20 -? 2Mg2 + 4HC03 + <br />SiO2(s) (g) <br />2. Alumino Silicates - deposition of clay <br />2 NaAlSi308(s) + 2COz(g) + llHzO -> Al2Si205(OH)4(s) <br />albite kaolinite <br />+ 2Na+ + 2HC03 + 4H4SiO4 (9) <br />0