Just butting in on the hybrid thing. Although I agree that you can get a (reactive) dark line where two colors (like green and yellow) meet . . . that looks like it's really red there -- at least on my monitor. If so, red is a primary color, meaning you can't get it from blending. It just is. (Along with the other 2 primary colors, yellow and blue.)
So to my mind that marble is a hybrid, in that it has two of the normal Popeye colors (green & yellow) plus a third, probably deliberately introduced one -- red.
I don't think the length of each color in the ribbon is an indicator, in this sense. Picture three tubes of toothpaste side by side, and one runs out before the others . . . or, in the case of a marble like this, the angle of the shear or the color submerging into the base glass (for any number of crazy reasons) could explain it . . .
As an aside, green is a secondary color -- meaning you get it from blending two of the primary colors together -- yellow and blue.
If she's ordering storage containers I think we got her.