71421887 - Outer Siq Yellow Treasury Morning Petra, Jordan Petra, Jordan. Treasury built by the Nabataens in 100 BC. Yellow Canyon becomes rose red when sun goes. Reds are created by magnesium in sandstone.71099250 - Young male climber blowing away the magnesium from his hand at a rock face, Schwaerzer Wand, Bavaria, Germany71099194 - Young female climber using her magnesium for her hands, Pottenstein, Franconia, Germany70166660 - Red cliffs because of iron and magnesium sandstone. Zion National Park. Utah. USA71110718 - A climber preparing the smooth granite, taking away all the magnesium left by the others climbers. Masino Valley Lombardy Italy Europe
