Characterization and Identification of Coal and Carbonaceous Shale Using Visible and Near-Infrared Reflectance Spectroscopy

Table 2

X-ray fluorescence (XRF) and proximate analysis of samples in Figure 1.

Sample	XRF analysis (wt. %)				Proximate analysis (wt. %)
	SiO2	Al2O3	Fe2O3	Matrix	Volatile	Ash
Bituminite (a)	8.63	5.01	0.87	82.60	13.74	16.05
Bituminite (b)	10.61	6.17	0.81	79.12	16.14	18.22
Bituminite (c)	10.68	8.40	3.39	73.94	21.57	23.95
Carbonaceous shale (d)	26.46	19.98	3.14	47.80	7.86	51.80
Carbonaceous shale (e)	32.13	21.20	1.04	41.25	4.31	57.55
Carbonaceous shale (f)	45.65	30.14	0.92	20.24	1.51	78.94