41. Marie Curie used pitchblende , processing tons of it herself, as the source material for her isolation of radium in 1898. 42. After numerous experiments in the ESPCI laboratories, she found out that pitchblende was 4 times more radioactive than uranium or thorium. 43. Desperately he informs them of his family's mine back home that contains pitchblende , tungsten, and other precious metals. 44. Zippeite is no longer used for the manufacture of paints, but is still used as a uranium ore, as is pitchblende . 45. This misconception prompted the band to cheekily rename itself The Pitchblende Quartet for its final 1995 album, " Gygax ! ". 46. A principal source for radium is pitchblende , which holds a total of 257 mg of radium per ton of U 3 O 8. 47. Although the zinc skarn and the pitchblende vein are exposed in the same workings, the pitchblende appears to have been deposited much later. 48. Although the zinc skarn and the pitchblende vein are exposed in the same workings, the pitchblende appears to have been deposited much later. 49. Although radium had been discovered in 1898, it had been derived from pitchblende , and the radium content of carnotite was not known. 50. The mines were forced out of business in 1923, when rich pitchblende deposits in the Belgian Congo forced down the price of radium.
