|Close inspection of the rocks in the Passaic Pit at Sterling Hill can
reveal some very interesting secondary minerals. I am not certain what the
green mineral is, but it appears to be a secondary copper mineral such as
malachite. The rock also contains galena, sphalerite, and some
hydrozincite, all on a matrix of mostly calcite. There is also what may be
cerussite, in very small amounts near the galena.
This specimen is fluorescent, too. The sphalerite shows up as orange, the calcite as orange-red, and the hydrozincite as blue under SW UV.
Specimen is about 2.5 inches across.