Actually, we know there are indeed clays within Nili Fossae, as well as olivine and pyroxene. Rocks in Nili Fossae also contain carbonate minerals.
NASA/JPL/University of Arizona (279 km above the surface, less than 1 km across)
The Clays Might Be Here near Nili Fossae
from UAHiRISE (NASA)
Abounding in Geologic Chaos
In East Candor Chasma
Meandering in Cydonia Mensae
Cratered Layered Terrain and Wall Slopes in Melas Chasma
HiClip minis from HiRISE (High Resolution Imaging Science Experiment) onboard the Mars Reconnaissance Orbiter.
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