Already told you guys what the rock is: by all the data available, I deduced it could only be a Horta egg. Um, BTW, Hermie, x-ray, radio, gamma, and microwave aren't light spectra. Invisible light spectra are limited to UV and IR.
I am not a scientists but I have found your statement "invisible light spectr are limited to UV and IR" not to be totally true. I have learned this invisible light radiation spectrum is not light but it is not dark.
I have learned the invisible light radiation spectrum (which includes non-ionizing radiation) will cause objects that appear to be dark or invisible to be exposed. I have found the invisible light radiation spectrum to be in common use by astronomers to view galaxies or radiation gas clouds that cannot be seen through a normal telescope or with the naked eye.
What the heck is a Horta egg? This is a gemstone.
DWJ