As a solid, magnesium has a gray, silvery-white hue. Magnesium is an alkali earth metal that was discovered in 1855 by the Scottish chemist Joseph Black. He was able to differentiate from calcium, an element that exhibited similar properties and was long thought to be the same as magnesium.
Magnesium has a shiny luster, also known as a glow. When it burns, magnesium creates a white light. As listed on the periodic table of elements, magnesium has the symbol Mg, an atomic mass of 24.30 and the atomic number 12. Magnesium is often used for medical purposes in laxatives and antacids. It is widely available throughout the planet.