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Table 5 Clay minerals classification based on Th/K after (Klaja and Dudek 2016)

From: Determination of clay minerals using gamma ray spectroscopy for the Zubair Formation in Southern Iraq

No. Th(ppm)/K (%) Minerals
1  < 0.6 Feldspars
2 0.6–1.5 Glauconite
3 1.5–2.0 Micas
4 2.0–3.5 Illite
5  > 3.5 Mixed-layer clays
6 Ten and above Kaolinite and chlorite