Galena
Written by Boss Tambang Tuesday, 01 December 2009 23:58
Galena is lead sulfide, PbS, and is the most important ore of lead. It’s a soft mineral of Mohs hardness 2.5 and a high density, around 7.5 times that of water. Some specimens are bluish-gray, but this one is so close to gray that I’ve turned the image to grayscale to erase the misleading iridescent highlights the scanner gives it. Galena has a strong cubic cleavage that is apparent even in massive specimens. Its luster is very bright and metallic. Good pieces of this striking mineral are available in any rock shop and in occurrences around the world. This specimen is from the Sullivan mine in Kimberley, British Columbia. Galena forms in low- and medium-temperature ore veins, along with other sulfide minerals, carbonate minerals, and quartz. These can be found in igneous or sedimentary rocks. It often contains silver as an impurity, and silver is an important byproduct of the lead industry.
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