The Sais Quartzite is a geologic formation exposed in the Los Pinos Mountains of central New Mexico.

The formation consists of up to 600 feet (180 m) of massive gray quartzite beds, 3 to 5 feet (0.91 to 1.52 m) thick, interbedded with thinner sericite-bearing quartzite beds.

The individual grain size in the beds is generally less than 1mm.

[2] Detrital zircon geochronology a minimum age of 1670 million years (Ma), corresponding to the Statherian period of the Paleoproterozoic.

Dapples in 1946 and named for the Sais station of the Santa Fe Railroad near Abo Pass.