API RP 13K pdf download Chemical Analysis of Barite The only HCl insoluble Na and K compounds sometimes found in barite are Na and K feldspars,which aresoluble in HF/H,SO HNO,mixed acids. The difference in Na and K values obtained by these two extractions cangive an estimate of Na and K feldspars in barite. 4.3.5 Calcium(Ca), magnesium (Mg), and iron (Fe)...