This month I'm pleased to present a breathtaking 20.46g specimen of the recent Martian shergottite fall Tissint. The fall was observed back in July 2011 in Morocco. After much speculation, the total known mass was agreed to be around of 7kg, although it's likely this has gone up slightly recently. This image was kindly provided by Graham Ensor. Click
here to view the image in the Gallery or
here for our archive of all previous "Image of the Month" images.