Geochemical Characterization of Sedimentary Materials (Limestone, Gypsum, Coal, and Iron Ore) along the Nile River Basin, South Wollo, Ethiopia

Table 6

Petrographic analysis of gypsum, sandstone, and clay samples (wt%).

Code	Gypsum	Opaque Fe2O3	Clay	Volcanic glass	Quartz	Plagioclase	Sanidine
WG-1	95	5	nd	nd	nd	nd	nd
WG-2	90	3	7	nd	nd	nd	nd
WM-1	95	3	2	nd	nd	nd	nd
KS-1	nd	7	10	nd	85	nd	nd
KS-2	nd	5	4	nd	91	nd	nd
KC-1	nd	5	30	nd	65	nd	nd
DC-1	nd	10	75	nd	6	10	nd