Nature Picture Library Sanidine, high temperature form of potassium feldspar, K(AlSi3O8), from near Beaverdell, British Columbia, Canada - John Cancalosi
Nature Picture Library Marginal leaf necrosis and chlorosis caused by potassium (K) deficiency to a Grape (Vitis vinifera). - Nigel Cattlin
Amazon.com: Nature Made Potassium Gluconate 550mg, 100 tablets: Health & Personal Care