@adythianusantara: Senyawa Kimia Mayor (paling dominan) pada Abu Vulkanik : • Silika (SiO₂): 45–75% — komponen terbanyak, berupa gelas vulkanik & kristal silika (kuarsa, kristobalit) • Alumina (Al₂O₃): 10–23% — menambah kekerasan • Oksida Besi (FeO/Fe₂O₃): 5–14% — memberi warna gelap/coklat kemerahan • Kalsium Oksida (CaO): 1–11% • Magnesium Oksida (MgO): 1–4% • Natrium Oksida (Na₂O) & Kalium Oksida (K₂O): masing-masing 1–5% Dari berbagai sumber, disarikan oleh Adythia Nusantara

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Sunday 06 September 2026 04:39:45 GMT
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