This image shows a thin section of a piece of the Allende meteorite that fell to the ground in Mexico on February 8,...

This image shows a thin section of a piece of the Allende meteorite that fell to the ground in Mexico on February 8, 1969. The photo was taken through a light microscope using cross-polarized illumination. Allende is a carbonaceous chondrite meteorite notable for its calcium-aluminium-rich inclusions (CAI). It’s one of the oldest objects in the Solar system. This kind of meteorite is older than chrondules and even older than the Earth itself.

Source: http://epod.usra.edu/blog/2013/07/thin-section-of-allende-meteorite.html