The photos show a thin section I made from a Horn Coral fossil I purchased from the Rock Shed. Two thin section slides were made from the cut off section.
The fossil is approx. 12mm across the section.
Photo 1 is the fossil after cutting off two sections.
Photo 2 is a complete scan of a thin section at 20x mag. in Plane Polarized Light
Photo 3 is is a complete scan of same area at 20x mag. with Crossed Polars
Photo 4 is a detail at 40x mag. with Crossed Polars and a Lambda plate in the light path.
The thin section slides were photographed with a Canon 5D MkII camera with a Meiji 2.5x projection lens on a Labomed LB-592 polarizing microscope.
Post processing was in Adobe Lightroom.