Physicochemical Characterization of Indonesian Natural Clay from Hutumuri, Ambon City, Indonesia as a Low-Cost Porous Material H. Tehubijuluw, E. K. Huliselan, R. Subagyo, R. E. Nugraha, A. A. Jalil, I. W. Sutapa, Rahayu, D. Sri, N.F. Jaafar International Journal of Acta Material Vol. 2 No. 2 2026 DOI 10.62749/ijactmat.v2i2.31