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Apatite is an important biomineral, which §constitutes the endoskeleton (bones and teeth) in §vertebrates including humans. The interaction §between the apatite surface and biological §environment plays a key role in biomineralization. §To understand the interaction between apatite and §inorganic species, atomic scale information of the §apatite surface and the apatite biomolecular §interface is required. In this work, the structure §of fluorapatite (100) surface was first investigated §in dry environmental conditions using Grazing §Incidence X-ray Diffraction (GIXRD). Further, to §understand the apatite biomolecular interface, §experiments were performed under humid and §completely hydrated conditions, which were then §followed by apatite aqueous glycine interface study. §Measurement and analyses of specular and non-§specular crystal truncation rods in all cases §provided information about the surface structure of §the mineral and sites of adsorption at the atomic §scale. Simulation studies supported the experimental §results.