एक खनिज जिसमें यूरेनियम ऑक्साइड और रेडियम और थोरियम और पोलोनियम और लीड और हीलियम की ट्रेस मात्रा होती है; बड़े पैमाने पर उरनाइट को पिचब्लेंडे कहा जाता है जो मुख्य यूरेनियम अयस्क है

pitchblende's Usage Examples:

and Mme Curie subjected a large amount of pitchblende to a laborious process of fractionation, with the result that in 1898 they announced the existence in it of two highly radioactive substances, polonium and radium.

After the discovery of the radioactive properties of uranium by Henri Becquerel in 1896, it was noticed that some minerals of uranium, such as pitchblende, were more active than the element itself, and this circumstance suggested that such minerals contained small quantities of some unknown substance or substances possessing radioactive properties in a very high degree.

Pure pitchblende is U308, which, in relatively good specimens, forms some 80% or more of the whole.

In 1789 Klaproth isolated from pitchblende a yellow oxide which he viewed as the oxide of a new metal, which he named uranium, after the newly discovered planet of Herschel.

Pitchblende attained considerable notoriety towards the end of the 19th century on account of two important discoveries.

Klaproth's detection of a previously unknown constituent of the mineral pitchblende.

artificial pitchblende, which serves as a starting-point for the preparation of uranium compounds.

The only practically available raw material for 'the extraction of uranium is pitchblende (q.v.).

Pitchblende >>

To extract the metal, the pitchblende is first roasted in order to remove the arsenic and sulphur.

pitchblende's Meaning':

a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore