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In this paper we have presented a detailed response to Ertl et al. (2012a) who, in a paper in volume 97 (year 2012), pages 1402-1416, this journal, claim evidence for limitations of Fe 2+  and Mn 2+  occupancy at the Z site of the tourmaline structure. They also propose a model by which the &lt;Z-O&gt; distance of tourmaline varies as a function of its &lt;Y-O&gt; and &lt;T-O&gt; bond lengths. We have examined their conclusions and find that a different distribution of cations over the Y and Z sites gives better agreement with the extensive experimental information available. In fact, on the basis of crystalstructure refinements, Mössbauer spectroscopy, optical absorption spectroscopy, bond-valence theory, ionic radius concept and literature, the occurrence of Fe 2+  at the Z site of tourmaline is well supported. Conversely, existing experimental data does not provide indisputable evidence for the occurrence of Mn 2+  at the Z site. Despite this, there is no evidence for inductive effects of  Y Mn 2+  on &lt;Z-O&gt;, and the proposed effects must be regarded as speculative. Statistical analysis shows that the &lt;ZAl-O&gt; average value is 1.906(2) Å, which is consistent with the observed values of &lt;ZAl-O&gt; at the 99% confidence limit (within 3σ) in tourmalines with the Z site fully occupied by Al. Consequently, the proposed inductive effect of &lt;Y-O&gt; and &lt;T-O&gt; on &lt;Z-O&gt; can be ruled out.

american mineralogist

A critical comment on Ertl et al. (2012): “Limitations of Fe 2+  and Mn 2+  site occupancy in tourmaline: Evidence from Fe 2+ - and Mn 2+ -rich tourmaline”