This proposal seeks neutron diffraction beamtime to study two important systems. We have demonstrated that monofluorophosphate (PO3F) can be substituted into gypsum (CaSO4.2H2O) to provide an improved biocement. However, we wish to study the structural implications of the replacement of SO4 by isoelectronic PO3F and the implication on reduced hydrogen bonding to the structural water molecules commonly seen with the presence of fluorine. The second part of this proposal seeks to study lithium manganese oxides formed from biogenic sources. Biogenic Mn oxide is a low cost alternative to synthetic forms and is environmental friendly and can be used to extract lithium for the environment. Indeed, initial results show improved Li uptake with biogenic forms. However the subtle differences in structure have yet to be studied in detail and neutron diffraction offers such an opportunity.