2026. Analysis of the Relationship Between SiO₂ Content in Volcanic Tuff Materials from Lampung at Hatta Bakauheni Using Portable XRF as a Supporting Method for Rock Magnetism in Determining Their Magnetic Properties. Journal of Science, Technology, and Innovation. 1, 3 (Apr. 2026), 104–114. DOI:https://doi.org/10.65310/ezzxgs33.