Multiple grains of merrillite and apatite have been previously identified in the samples returned by the Japan Aerospace Exploration Agency (JAXA) Hayabusa spacecraft from the S-type asteroid 25143 Itokawa (Harries and Langenhorst 2014; Tsuchiyama 2014; Harries and Langenhorst 2018; Terada et al. 2018). Although textural occurrences of these phosphates have been documented, their chemical and isotopic compositions are poorly known. Here, we propose to measure the chemical and oxygen isotopic compositions of phosphates from the Itokawa asteroid and from several brecciated and non-brecciated L and LL EOCs. We chose to assess similarities and differences between phosphates from EOCs and the Hayabusa particles since previous studies revealed that the composition of the Itokawa asteroid is consistent with a brecciated EOC, more precisely a LL5-6 chondrite (Nakamura et al. 2011; Yurimoto et al. 2011; Nakashima et al. 2013). The data to be obtained will be used to (i) measure the abundance of volatiles and oxygen isotopic composition of the Itokawa and EOC phosphates to determine the fluid chemistry of the OC parent bodies, and (ii) examine the source of metasomatic fluids and their role during thermal metamorphism on the Itokawa asteroid and L and LL chondrites.