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Data from this study compared to the unit cell volume change of the lattice estimated for substitution of Sr and Mg to Ca. X represents either Sr or Mg. 
Data from this study with the linear fit of the data points; 
Strontianite (SrCO3)-aragonite (CaCO3) solid solutions from [39] with the linear fit of the data points; 
Estimate for Mg substituting Ca in the aragonite.
