Alga Crater rim

This image taken by the Colour and Stereo Surface Imaging System (CaSSIS) onboard the ExoMars Trace Gas Orbiter shows part of Alga Crater rim. The image was acquired on 28 January 2021.

Alga Crater is located in the southern highlands of Mars and is well-known for its colour diversity.

Bluer tones are more dust covered. The greenish colours are typically mafic minerals such as magnesium and/or iron-rich silicates, although spectroscopy is required to provide the most accurate identification.

The image is centred at 333.3ºE/24.5ºS. North is roughly to the left.

Read more about how CaSSIS reveals the colour diversity of Mars here