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Write a balanced chemical reaction illustrating the substitution mechanism between albite and anorthite in the plagioclase...

Write a balanced chemical reaction illustrating the substitution mechanism between albite and anorthite in the plagioclase feldspars.

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Answer #1

Solution

Albite formula = NaAlSi3O8

Anorthite formula = CaAl2Si2O8

Reaction is: nNaAlSi3O8 + nCaAl2Si2O8 = (NaAlSi3O8 – CaAl2Si2O8)n (repeating units)

                        Albite        +   Anorthite   = plagioclase feldspars

In case if we substitute 2 Al3+ for Si4+ than it allows Ca2+ to be added Albite-Anorthite series. Further, feldspars are commonly depicted by the formula = XAl(1-2)Si(3-2)O8 .

Where: X = Na / K / Ca.

In case of Na+ and K+ the formula will contain 1Al & 3Si ions and in case of Ca2+ the formula will contain 2Al & 2Si ions for a balanced chemical formula.

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