Geochemistry and mineralogy study of selected bituminous medium volatile coals from upper Kutai basin, Central kalimantan

The coal samples spectra on FTIR analysis indicated the coals are classified into bituminous in rank. XRD analysis of coal shows minerals content on coal samples are clays minerals (kaolinite, smectite), silicate minerals (quartz, sericite, plagioclase and mica), carbonates (calcite, siderite), sulphate (anhydrite) and sulphides (pyrite).