An interesting rock from the Passaic Pit
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.

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