1. The mine had a " tremendously rich lode of uranium pitchblende . 2. Deeper ore is pitchblende and coffinite with abundant pyrite and marcasite. 3. In 1789 the chemical element uranium was discovered in pitchblende from Johanngeorgenstadt. 4. The uranium occurs as pitchblende in a hydrothermal vein deposit in Precambrian granite. 5. Primary mineralization consists of pitchblende and coffinite, with weathering producing secondary mineralization. 6. Lenses of massive pitchblende occur locally with a width of over 1 m. 7. Giesel isolated from pitchblende a lanthanum-containing fraction which showed unique properties. 8. Working with the mineral pitchblende , the pair discovered a new radioactive element in 1898. 9. Marie Curie began her investigations by testing a uranium ore called pitchblende with an electrometer. 10. Pitchblende is a complex mineral; the chemical separation of its constituents was an arduous task.
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