The chemical composition and thermal behaviour of Nawangan-phyropyllite have been studied using XRF, powder XRD and FTIR. The fourier transfornation infrared was applied to analyze the phyropyllite after treating by calcinating at variuos temperature. Initial investigation has also been carried out by adding sodium hydroxide and potassium hydroxide to study the possiblity of phyropyllite as geopolymer materials. The phyropyllite contains Si(57.7% ), Al(16,7%), K (20.6%), Fe (2.47%) Ti (2.33%) and Cu (0.088%). Based on the XRD difractogram, peaks at 2 theta (9°, 20°, 21°, 26 °, 34 °, 36 ° and 39 °) were characteristic for phyropyllite. While, infrared study showed that at 3630 cm~(-1), 756 cm~(-1) and 938 cm~(-1) are responsible for phyropyllite's peaks. The hydroxyl bonded to alumina still existed under heating up to 400 °C and disappered at 600 °C. It indicted that covalent bond of Al-OH was broken. By heating at 600 °C, the peak at 1021 cm~(-1) splitted into two peaks, 990 cm~(-1) and 1049 cm~(-1). It may be due to the displacive transition. By adding NaOH 10 M , the peak intensity of Al-OH (3630 cm~(-1)) reduced to 17% but the peak intensity of Al=O (1661 cm~(-1)) incresed to 14% and the new peak (5%) emerged at 1387 cm~(-1)(O-Al-O). The most reactive phyropyllite was obatained by adding KOH 5 M. The present of reactive functional groups (Al=O, O-Al-O and Al-OH) indicates that the local phyropyllite has a good change as geopolymer materials.
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