One of the surprises at Huanggang was the presence of aquamarine crystals.  Although the mine cluster is exploiting a skarn, there is a pegmatite intrusion present.  It is from that pegmatite that these aquamarines have been coming.

This is the largest single crystal of aquamarine that I have seen from the location.  About a year and a half ago there were a few clusters available, but no more were found.  Along with those clusters, I would consider this to be one of the more notable aquamarine examples from the location, typically the crystals stayed under 5 cm, with 6.5 cm being considered very large.

The termination is deep blue, the rest (as with all of these) has a whitish rind-- probably due to etching that is causing the light to diffuse