The degree of radioactivity within this interval is highly variable and associated with visible pitchblende
The assumption by that time was that pitchblende
's dramatic ionizing power was caused by a new, heretofore unknown element.
Preparation and analysis of synthetic sample of Pitchblende
The Belgian Congo ore ("pitchblende
") that was processed downtown at Mallinckrodt Chemical Works averaged 60-65 percent uranium.
They consist of finely disseminated pitchblende
, with minor chalcopyrite, pyrite and galena.
These contain quartz and sulphide veins and are characterized by a collection of uranium minerals such as pitchblende
, coffinite, uraninite and black U-oxides (parapitchblende) (Arribas, 1962), being the pitchblende
usually replaced by sulphides, especially pyrite and melnikovite.
The cataclastites in the central part of the deposit are sometimes enriched in graphite and sulphides, and host uranium mineralization enriched in coffinite, partly also pitchblende
. In the southern part of the deposit, the OR-5 shear zone splits to a higher number of thinner shear zones (OR-5, OR-5a, OR-3, OR-3b) (Figs.
could be a symbol for Curie's dark and complex life: Embedded in both were elements of extraordinary brilliance and intensity.
LaBine found pitchblende
on the lake's eastern shore.
Its most common ore: a marblelike rock called pitchblende
 A 1946 stamp shows a photograph of Great Bear Lake, NWT, where pitchblende
was discovered by Gilbert A.