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Radium is a chemical element with symbol Ra and atomic number 88. Radium is an almost pure-white alkaline earth metal, but it readily oxidizes on exposure to air, becoming black in colour. All isotopes of Radium are highly radioactive. Pitchblende is a massive variety of the mineral Uraninite. Uraninite is a radioactive, uranium-rich mineral and ore with a chemical composition that is largely UO2, but also contains UO3 and oxides of lead, thorium, and rare earth elements. One ton of Pitchblende typically yields about one seventh of a gram of Radium.