Chemical structure of the salt Ca[Al(OH)(H<sub>2</sub>O)Az<sub>2</sub>]•2H<sub>2</sub>O where Az<sup>2−</sup> is the dianion of <a href="https://en.wikipedia.org/wiki/alizarin" class="extiw" title="w:alizarin">alizarin</a>. Diagram copied from <a rel="nofollow" class="external text" href="https://books.google.com.au/books?id=P8B3KEpkqxIC&amp;pg=PA669#v=onepage&amp;q&amp;f=false">Figure 14, p. 669</a>.
<a href="https://en.wikipedia.org/wiki/User:EdChem" class="extiw" title="w:User:EdChem">EdChem</a>
<span class="int-own-work" lang="en">Own work</span>