| 11. | In the first extraction of radium Curie used the residues after extraction of uranium from pitchblende.
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| 12. | The product that eventually results from weathering of uranium is U 3 O 8, pitchblende.
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| 13. | ;1898 : Maria Sklodowska-Curie and Pierre Curie isolate radium and polonium from pitchblende.
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| 14. | Pitchblende was discovered in 1948 in the Caribou silver mine at the town of Boulder County.
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| 15. | In the classical procedure for extracting uranium, pitchblende is broken up and mixed with volatility methods.
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| 16. | He helped unearth the vast and profitable pitchblende deposits in the far north region of the province.
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| 17. | Pitchblende orebodies were also discovered in the Calhoun mine, the Kirk mine, and some others.
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| 18. | The oldest type of mineralisation consists of quartz, calcite, fluorite, pitchblende and minor hematite.
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| 19. | It shows how uranium, originally sourced from pitchblende, became the subject of intense scientific study.
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| 20. | On December 21, 1898, the Curies detected the presence of another radioactive material in the pitchblende.
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