The blue we see in this image is likely basaltic (volcanic) sand. Pasteur Crater is approximately 116 kilometres in diameter and was named after renowned French chemist Louis Pasteur.

ID: ESP_054448_1995
date: 9 March 2018
altitude: 283 km

https://uahirise.org/hipod/ESP_054448_1995
NASA/JPL-Caltech/UArizona
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