Is the original question really about being "prismatic" (dispersion into rainbow colors)?

I'm understanding the question to be something different.

"effect along the edge of a thick piece of glass"

This sounds like you're asking about how the edge of a pane of glass looks green. This is not a "prismatic" effect, but it is the "edge" effect of glass, caused by total internal reflection creating a long path through glass, which contains iron deposts that absorb red and blue more than green. This is "absorption", not "dispersion".

So what are you after?

Note: A picture is worth a thousand words.

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)