CRISM: Iron-magnesium clays at Isidis Basin rim

This image is located right along the rim of the Isidis impact basin, at the foot of Libya Montes. Here we see iron-magnesium phyllosilicates (cyan). Phyllosilicates are clay and clay-like minerals formed by chemical reactions with liquid water. They are very thin (microscopic) stacked layer crystal forms, also called sheet silicates. Libya Montes is part of a series of mountains that rim the gigantic Isidis impact basin… [More at link]