Zinc, a blue-gray, metallic element, is a moderately good conductor of electricity. Zinc (Zn) is brittle, but it becomes malleable at 100° C. The most common alloy is brass, which is a mixture of zinc and copper. Zinc is recovered from a number of different zinc minerals. The most significant of these is sphalerite. Other minerals, such as smithsonite (ZnCO3, zinc carbonate), and zincite (ZnO, zinc oxide) are also zinc ores. Zinc is also recycled from scrap.