Calcium and Mg isotope geochemistry is currently becoming a more mature field than even a few years ago. In that regard, our new book will include fundamental advances in Ca and Mg isotope geochemistry including recent developments on biological fractionation and biochemical applications. It also offers a more intimate link between the method and applications chapters as it was possible in the above volume that includes very diverse "non-traditional stable isotope" systems. Furthermore, a thorough combined discussion of Mg and Ca isotope fractionation has not yet been presented, even...