Zirconium (symbol: Zr) is an element with an atomic number of 40. It is a rare element of the carbon-silicon group, intermediate between the metals and nonmetals. It is a ductile, malleable metal. It is obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance. The element has no known biological role in the human body. However, it is present in the human body, typically, at 250 mg on average, from the diet. It is present in plants and plant materials, e.g. whole wheat, brown rice, and spinach.
© Biology Online. Content provided and moderated by Biology Online Editors