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S <br />• 2. Carbonate Minerals - reactive dissolution <br />CaC03(S) + C02(g) + H2O F Ca2+ + 2HCO3 (3) <br />calcite <br />or CaC03(s) + HC03 + H+ 4 Ca 2+ + 2HC03 (4) <br />In this ca se, reac tants in the weathering came from <br />the water or air. <br />3. Quartz - reactive dissolution <br />Si02(S) + 2H2O H,Si04(aq) (5) <br />quartz <br />SiO2 (s) + H2O + O H t H3SiO4 (6) <br />B. Incongruent Re action - solid resid ues are deposited as <br />products <br />1. Simple sil icates - congruent o r incongruent <br />Mg2SiO4(S) + 4C02( g) + 2H20 -f 2Mg2+ + 4HC03 + <br /> H4SiO4(aq) (7) <br />Mg-olivine <br />or <br />MgZSi04(S) + 4CO2(g) + 2H20 -} 2Mg2+ + 4HC03_ + <br />SiO2(s) (8) <br />2. Alumino Silicates - deposition of clay <br />2 NaAlSi308(s) + 2CO2(g) + 11H2O -> A12Si2O5(OH)4(s) <br />albite kaolinite <br />+ 2Na+ + 2HC03 + 4H4SiO4 (9) <br />0