**4.8.5 Radium iodoapatite**

Radium iodoapatite, if could be formed, would have the formula Ra5(PO4)3I but it has not been prepared yet. This salt would be probably best prepared by solid-stare reaction [135]:

$$66\text{ RaHPO}\_4 + 3\quad \text{RaCO}\_3 + \text{RaI}\_2 \rightarrow \text{Ra}\_{10}\text{(PO}\_4\text{)}\_6\text{I}\_2 + 3\text{ CO}\_2 + 3\text{ H}\_2\text{O}\tag{51}$$

Whether this compound can be formed remains speculative.52
