The inspiration for the lamp's name came from the noticeable light fraction of the agate.
The effect is easily seen on the second photo.
This shadow fall, which visually splits the disk, is a light fraction.
All this happens because of the so called "cryptocrystalline" inner structure of the agate which is out of "phenothreads".
These are so fine, that the crystals are only recognizable at 40.000 times zoom.
This light fraction and the contrast in the Spectrum baroque glass make the head and tail of my comet.
Please click on a thumbnail below to enlarge it. The link in the titel can bring you to "what is a comet" explanation.
Mass of the lamp height: 555mm, width: 197mm, depth: 140mm
Mass of the agate 197mm times 147mm