pitch-blende

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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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
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