Pitchblende is black, opaque mineral with a dull, pitch like luster. The hardness is 5.5 and the sp. gr., witch is extremely high for a mineral, ranges from 9.0 to 9.7. It crystallizes in the isometric system and usually occurs in massive formations as a constituent of granite rocks and pegmatites or as a secondary mineral associated with silver, lead or copper ores. Large deposits of Pitchblende are located in South Africa, Czechoslovakia, Canada, Germany, and France. In the US the most important source is a deposit found in Marysvale, Utah. Smaller deposits have been discovered in Connecticut, North California, and Colorado.
Amethyst Mineral Gallery