Geochemical and Morphometric Characterization of Mt. Ronggo (Scoria Cone), East Java, Indonesia: Insights into Monogenetic Volcanism and Edifice Instability Muhammad Andriansyah Gurusinga, Yusuf Bagaskoro, Dzikru Aminulloh, Septyo Uji Pratomo, Peter Pratistha Utama, Andhika Nugraha OPHIOLITE : Jurnal Geologi Terapan Vol. 8 No. 1 2026 DOI 10.56099/ophi.v8i1.p1-12