Table 1. Calibration statistics for each mineral component.

[wt%]	RMSEC	RMSECV	R2	RMSEP - Validation	RMSEP - Shale
Quartz	2.2	2.7	0.979	4.0	5.7
Illite	2.0	2.3	0.986	2.5	17.2
Montmorillonite	2.3	3.0	0.982	3.6	14.6
Kaolinite	1.2	1.4	0.962	1.7	2.3
Albite	0.9	1.1	0.984	1.2	3.1
Orthoclase	1.9	2.2	0.857	1.9	4.0
Calcite	1.0	1.3	0.994	1.8	2.4
Dolomite	1.6	1.9	0.927	4.3	4.0