Galena is a very rare trace mineral in West Virginia coals that almost
always occurs as small void fillings in
organic coal components such as semifusinite ("fossil charcoal"). Galena
often fills these voids along with other minerals, both trace and major
minerals, such as in the SEM photomicrograph
shown here. Voids in semifusinite in the Stockton coal were filled
by in situ growths of kaolinite (Al4(Si4O10)(OH)8),
galena, chalcopyrite (CuFeS2)
and sphalerite (ZnS). Galena and chalcopyrite
both grew within a single 30 µm opening. (Dots at the bottom of the
photograph are each 10 µm apart.)
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