Last summer, I snuck out with a row boat around 4am. Eventually with the sun risen but still quite low in the horizon, I was rowing in the middle of the absolutely still lake when I witnessed an optical phenomenon unlike anything that I've ever seen before: I found myself enclosed in a triangle in which, the sun was in one corner, and in the other corners, the surface of the lake had turned rainbow-colored.
As a photographer I technically understand what happens there, i.e. even though it looked clear to the eye, there obviously must've been some nocturnal mist left on the water surface to act as a medium, and, had there been more moisture particles higher up in the air, I should've seen an entire rainbow connecting these two reflections. But due to the conditions, apparently all I saw was the ends of the rainbow, on their own.
I tried to search for instances or info on this, but found none. Does this specific phenomenon have a name? Under what conditions might one expect to possibly witness this phenomenon?
Here's a quick illustration of the setting, as perceived subjectively. I made a quick simulation of the sun in that time and location using Stellarium , and the sun was about 11° above the horizon (actual bald horizon, not including trees, hills etc.)