Mineralogical properties of pyroclastic materials from Mount Merapi, Indonesia Kurniati, Suwardi, Budi Mulyanto, Budi Nugroho, Welly Herman and Erlina Rahmayuni BIO Web Conf., 99 (2024) 05007 Published online: 01 April 2024 DOI: 10.1051/bioconf/20249905007