pitchblende

[pich-blend]
noun Mineralogy.
a massive variety of uraninite, occurring in black pitchlike masses: a major ore of uranium and radium.

Origin:
1760–70; half translation, half adoption of German Pechblende. See pitch2, blende

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Collins
World English Dictionary
pitchblende (ˈpɪtʃˌblɛnd)
 
n
a blackish mineral that is a type of uraninite and occurs in veins, frequently associated with silver: the principal source of uranium and radium. Formula: UO2
 
[C18: partial translation of German Pechblende, from Pechpitch² (from its black colour) + blende]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pitchblende   (pĭch'blěnd')  Pronunciation Key 
A brown to black, often crusty, cubic mineral that is a principal ore of uranium. It is highly radioactive. Chemical formula: UO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It is typically concentrated in areas with lots of granite, shale, phosphate and pitchblende.
It is especially concentrated in areas with lots of granite, shale, phosphate and pitchblende.
Uranium is present in rocks such as granite, shale, phosphate and pitchblende.
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