50mm x 20mm

In this agate we observe fortification banding that is so very fine as to become invisible to the naked eye. Parallax banding to an American. Are there any in the house? You would not be able to guess this patternatiom from the outside,  however densely banded stones are tangibly heavier than those with quartz centres, making logical sense. Banding as fine as this is, however, pretty bloody rare. I do not have even one other comparable example.