Definition & Betydelse | Engelska ordet PITCHBLENDE

Definition av PITCHBLENDE

1. (kemi) uraninit

Exempel på hur man kan använda PITCHBLENDE i en mening

• Uraninite used to be known as pitchblende (from pitch, because of its black color, and blende, from blenden meaning "to deceive", a term used by German miners to denote minerals whose density suggested metal content, but whose exploitation, at the time they were named, was either unknown or not economically feasible).
• Thus, although uranium is not dangerously radioactive when pure, some pieces of naturally occurring pitchblende are quite dangerous owing to their radium-226 content, which is soluble and not a ceramic like the parent.
• The uranium occurs as veins within quartz monzonite, granite and rhyolite, usually in the form of pitchblende, but also as umohoite, which was first identified at Marysvale.
• These wastes were initially created by Eldorado Mining and Refining Limited and its private sector predecessors, resulting from the refining of radium from pitchblende.
• In 1899, he discovered the radioactive element actinium, as a result of continuing the work with pitchblende that the Curies had initiated.
• At the suggestion of Lise Meitner, he recruited Stefanie Horovitz in 1914 to work from his Vienna lab processing lead from uranium-rich pitchblende and measuring its atomic weight to the thousandth of a gram.
• Below the water table, hypogene ores include uraninite (pitchblende), cobalt-nickel sulfides and selenides.
• Uranium anomalies in lake water detected in 1969 were followed up in 1971 with the location of radioactive pitchblende boulders in transported overburden, which were eventually followed back to their source, resulting in the discovery of the Gaertner orebody of the Key Lake deposits in 1975.
• However, approximately 100 km north of the lakes, there are several deposits of uraninite (pitchblende) / coffinite assemblages.
• Only the first type is a primary mineralisation, while the latter two carry remobilised pitchblende from the older vein types.
• Jollifeite's presence may also lead to the finding of other important minerals as it was found in the drill core with chalcopyrite, pyrite, hematite, arsenopyrite, bornite, calcite, dolomite, quartz, cofinite, pitchblende, native gold, native silver, cobaltite, and micas.
• The ore consisted of massive pods and disseminated veinlets of pitchblende, with secondary metatorbernite, autunite, gummite and gold, with minor pyrite, galena and chalcopyrite.
• 'Uranium occurs as a pitchblende and uraninite in a wide variety of deposits in granites and pegmatites, as disseminations in quartzites, as veins and disseminations in argillites and tuffaceous units, in shear zones and faults, and in granulites'.
• It operated initially with domestic ores, but de Lisle, confronted with the scarcity of such ores, eventually began to import a wide variety of ores including pitchblende, pyromorphite, and thorianite from foreign markets including Hungary, Canada and the United States.

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