Rocks, as in Diamonds, Emeralds, Sapphires, and so on ?
The hive is humming along. I am planning on opening things up the next warm day to assess their progress and install the feeder.
Michael,
I don't have a micrometer that will work on this and without a scanner or camera I did the best I could.
I sampled several cells from different parts of the comb, both older black and new paler comb. Using a ruler I measured from center to center of the cell wall.
That looks like right about 5mm center to center average. Some smaller and some right at 5mm slightly smaller inside. The larger was on the oldest dried out and darkest cells, and smaller on new cells. Older looked like the walls were thicker too.