Cleaning up some old concentrates, precious little gold, thought I'd throw it all under the microscope and see what made up the black sand...
Above, some garnet, peridot/olivine, the dark pink might not be garnet, possibility of other gems...
the orange stones are curious, there's what appears to be a metallic piece left of center above the olivine.
More orange, long yellow crystal of interest
Perfectly framed black crystal in drop of water
Note the good triangular faces, hematite?
And finally, a tiny piece of gold...