Pitch Blende
a mineral chiefly of 86.5 oxide of uranium, 2.5 black oxide or iron, galena, and silex. In color it extracted from it. from brown to black, and occurs ed, and pulverulent. Sp. gr. 7.5. It genumn of cellular tissues at or near the erally accompanies uranite. Radium is ed, and pulverulent. Sp. gr. 7.5. It gen- PITH, the cylindrical or angular colextracted from it. varies fro umn of cellular tissues at or near the