title: A spectroscopic comparison of selected Chinese kaolinite, coal bearing kaolinite and halloysite--a mid-infrared and near-infrared study.
abstract: Mid-infrared (MIR) and near-infrared (NIR) spectroscopy have been compared and evaluated for differentiating kaolinite, coal bearing kaolinite and halloysite. Kaolinite, coal bearing kaolinite and halloysite are the three relative abundant minerals of the kaolin group, especially in China. In the MIR spectra, the differences are shown in the 3000-3600 cm⁻¹ between kaolinite and halloysite. It cannot obviously differentiate the kaolinite and halloysite, leaving alone kaolinite and coal bearing kaolinite. However, NIR, together with MIR, gives us the sufficient evidence to differentiate the kaolinite and halloysite, especially kaolinite and coal bearing kaolinite. There are obvious differences between kaolinite and halloysite in all range of their spectra, and they also show some difference between kaolinite and coal bearing kaolinite. Therefore, the reproducibility of measurement, signal to noise ratio and richness of qualitative information should be simultaneously considered for proper selection of a spectroscopic method for mineral analysis.
authors.affiliation: School of Mining Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China.
authors.forename: Hongfei
authors.initials: H
authors.lastname: Cheng
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.forename: Qinfu
authors.initials: Q
authors.lastname: Liu
authors.forename: Jinshan
authors.initials: J
authors.lastname: Zhang
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D000077215:Clay; D003031:Coal; D007616:Kaolin / Q000737:chemistry*; D008903:Minerals / Q000032:analysis / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D019265:Spectroscopy, Near-Infrared / Q000379:methods*
chemical_list: D000538:Aluminum Silicates; D003031:Coal; D008903:Minerals; D007616:Kaolin; D000077215:Clay