@bewildered,
Loss of "credibility by you is actually quite comforting for me".Ive seen hundreds , nay thoussands of bubbles in my over 30 years with thin sections and I have rejected hundreds ofslides for that very reason. (I have my slides made by a service and thats all they do) Whenever bubbles appear, they show the typical "round" birefringence interference colors, of blue and yellow. Many of the "cells" in your slides show this feature, so they are rounded and have an extinction angle similar to the medium.
You will learn , or maybe not. You are wasting so much time by your stupid "Analyses" when you could get a good course in optical min to show you how we look at slides like these. Also the background ,mineral , from a quick view and not doing any confirmation , appears to be a zircon slice. Its own birefringence should be a yellow (munsell no ?) and a bluish purple (munsell no ?).
Id look at them further with the nichols analyzer and the wedge of quartz in the reticle of the scope.
Im curious, why has the presence of "red blood cells" become so important to you? What scientific basis allows you to conclude that these ARE RBC's??