The Tissint Meteorite was the first Martian witnessed fall since 1962. It is also special because the meteorite may contain carbon which has a biogenic origin. Under cross polarized light, thin sections of Tissint are a beautiful rainbow kaleidoscope of color in patterns similar to other Martian shergottites.
Photos of the fragment used to create thin section from Mr. Meteorite:
There are plenty of good research articles on the Tissint meteorite, here are just two:
Full Screen Meteorite Thin Section Panoramas: