Rocks under a microscope! This one is called Blueschist and it’s by far one of my favorites in thin section , the first clip with less color is the rock seen under Plane Polarized Light - this means only one light polarizer is being used & light vibrates on only one plane so only certain minerals will show colors. The more colorful clips are under Cross- polarized light - this uses two polarizers and makes it so that light can only pass through if a mineral interferes. This interference changes