| 21. | Marie Curie used pitchblende ore from J�chymov to isolate the element radium, a decay product of uranium.
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| 22. | Curie's systematic studies included two uranium minerals, pitchblende and torbernite ( also known as chalcolite ).
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| 23. | Her electrometer showed that pitchblende was four times as active as uranium itself, and chalcolite twice as active.
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| 24. | From a ton of pitchblende, one-tenth of a gram of radium chloride was separated in 1902.
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| 25. | This element was the first one discovered by the Curies while they were investigating the cause of pitchblende radioactivity.
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| 26. | They first separated out polonium from pitchblende in July 1898, and five months later, also isolated radium.
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| 27. | He was a student of Charles Friedel, was a close friend of pitchblende that the Curies had initiated.
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| 28. | While snooping around, Steve discovers the area is rich with pitchblende, an ore of uranium and radium.
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| 29. | Veins of this type contain dolomite, calcite, pitchblende, minor sulphides and selenides ( especially clausthalite ).
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| 30. | The only larger source for radium-containing pitchblende was the Institute for Radium Research in Vienna was opened.
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