Zinc is a with the 30 and the symbol Zn. At room temperature, zinc is a somewhat brittle metal with a silvery-greyish look when oxidation is eliminated. It is the first in periodic table group 12 (IIB). Zinc is chemically similar to magnesium in various ways: both metals have just one normal oxidation (+2), and the Zn2+ and Mg2+ions are of comparable size. Zinc is the 24th most abundant  in ’s crust and has five stable isotopes. The most common zinc ore is sphalerite (zinc blende), a zinc sulfide mineral. The largest workable lodes are in , Asia, and the . Zinc is refined by froth flotation of the ore, roasting, and final extraction using electricity (electrowinning).