Nurrahmi, S., Fuadi, N., Jumardin and Yurdanianti, F. 2023. Effect of Calcination Temperature Variation on Hydroxyapatite of Cuttlefish Shell Waste (Sepia Sp.). Gravitasi. 22, 1 (Aug. 2023), 31-34. DOI:https://doi.org/10.22487/gravitasi.v22i1.16312.