= Hydroxyapatite Standard Reference Material 2910b Certificate of Analysis by NIST
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https://tsapps.nist.gov/srmext/certificates/2910b.pdf
NIST certificate issued 22 October 2026. Page 1 gives the stoichiometric formula and describes calcium/phosphorus measurements by X-ray fluorescence and ICP-OES. Page 2 gives certified elemental mass fractions and Ca/P ratio. Appendix A, Tables A1–A2, supplies powder-diffraction positions and lattice parameters as values of potential interest, explicitly not certified values. Page 5 describes Cu K-alpha diffraction with a rotating-anode source and scintillation detector.
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