Magnesium is a metal. Specifically, it is an alkaline earth metal. Its atomic number is 12, and it was first isolated by the British chemist Humphrey Davy in 1808. More » Science Earth Science Geology

Magnesium is classified as an alkaline earth metal. Metals are defined as elements that can be hammered into sheets (malleable), made into a wire (ductile) and are good conductors of electricity and heat. More »

Magnesium has no hard and fast rule when it comes to extent of reactivity. With some compounds, Magnesium has no reaction, while it has a very strong reaction when coupled with others. More »

Talc is a metamorphic mineral that consists of hydrated magnesium silicate. More commonly known as soapstone, talc is a soft rock that is easy to shape and has been widely used to make decorative and practical objects fo... More » Science Earth Science Geology

Clay minerals are hydrous aluminium phyllosilicates that may contain varying amounts of iron, magnesium and alkali metals. These minerals are commonly found in the Earth's near-surface environments and form in soil and s... More » Science Earth Science Geology

The Earth's crust is composed of several minerals and elements, including iron, oxygen, silicon, magnesium, sulfur and nickel. Present in smaller amounts are calcium, aluminum and several other elements. The crust is the... More »

Mafic, or basaltic, igneous rocks contain a greater portion of iron and magnesium than silica, and they are often much darker in color, typically black, dark brown or dark gray, compared to the lighter-colored igneous ro... More »