K₀.₆₄ Na₀.₀₃ Ca₀.₀₇ (Al₁.₄ Fe³⁺₀.₃₉ + Mg₀.₁₇ Ti₀.₀₄)(Si₃.₄ Al₀.₆)O₁₀ (OH)₂ is a typical formula for illite.
The number of isomorphic substitution on the tetrahedral sheet is
A. 0.64
B. 0.74
C. 0.39
D. 0.22
E. 0.60

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