Fullscreen
Print

pitchblende

A massive variety of the mineral uraninite.

Pitchblende, amorphous, black, pitchy form of the crystalline uranium oxide mineral uraninite; it is one of the primary mineral ores of uranium, containing 50–80 percent of that element. Three chemical elements were first discovered in pitchblende: uranium by the German chemist Martin Klaproth? in 1789, and polonium? and radium? by the French scientists Pierre and Marie Curie in 1898. Deposits, frequently in association with uraninite or with secondary uranium minerals, are known in Congo (Kinshasa); the Czech Republic; England; the Northwest Territories and Saskatchewan in Canada; and Arizona, Colorado, Montana, New Mexico, and Utah in the United States. Britannica, Pitchblende (external link)

See Also
Uranium

Page last modified on Wednesday 18 of January, 2012 04:22:17 MST

Similar

Search Wiki PageName

Recently visited pages


Show php error messages
PHP (5.3.20) ERROR (E_WARNING):
File: tikilib.php
Line: 45
Type: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead
PHP (5.3.20) ERROR (E_WARNING):
File: tikilib.php
Line: 45
Type: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead
PHP (5.3.20) ERROR (E_WARNING):
File: tikilib.php
Line: 45
Type: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead