@bewildered,
Tabular inclusions are usually always concave because the viscosity of the fluid is just enough to allow a vesicle to collapse on itself giving a concave appearance.
Thin section microscopy is such a basic tool in geology that we begin our students training with it in the second semester of the freshman year. Its such a simple yet powerful tool that allows us to carefully document the crystal chemistry and structure of any sample. Every mineral with a chemical structure (think" ALL OF THEM) will leave a particular refraction pattern as light is transmitted through a slice of itself cut at a very specific thickness. (ALL color tables (munsell system) are keyed to a specific thickness.
To ascribe features to something like Mammalian red blood cells when the real answer is laying there like an open book is the height of defiant ignorance.
Kid, (Im assumimg that youre a kid because to continue in such an obsession as an adult, leads me to believe that youve got some OCD issue).
If you look at your source slide (I can undesrtand why Mr Phillips is pissed off--hes spent a good amount of time cutting and mounting all his meterorite samples to be seen through transmiotted polarized light and (I assume) reflected metallurgical analysis. SO what does bewildered come up with? He believes that these are all somehow tissues and blood cells from a heretofore unknown life form that is , of course mammalian because since there appears to be no "nucleus", it must be a a Mammals RBC. His mind works so simply . yet he misses out on the possibilities this tool provides.
Often ,a s a teacher, I have the kids first prepare their initial samples by cutting them on a rock slabber and then mount the small square cut sample on a slide.
The first deviation from the norm occurs when the ample glue (balsam or acrylic) starts drying and the student is still screwing with it so that air bubbles form in the glue. These wind up appearing like "Mammalian red blood cells" also because the air in the bubbles dissipates and the vesicle wall (the bubbles boundary( begins to collapse and thus forms a series oif indented concave or tabular air pockets. This also occus as chondrules in tektites and meteorites and even volcanic glasses and scorias.
The fact that there are many of these "bubbles" in the depth f field in the slide, this tells us that the thickness may be greater than the required 30 microns and the sample is showing bubbles both in focus and out of focus. These are bubbles or liquid inclusions not crystallized haem compounds which would show up entirely differently.
Kid needs some training in the microscopy and less in the mythology. It sounds, however, that his mind ios made up without any further discussions so who am I to piss on his pudding?