Wattersite is a rare mercury chromate mineral with the formula Hg+14Hg+2Cr+6O6.

[2] It occurs in association with native mercury and cinnabar in a hydrothermally altered serpentinite.

[3] It was first described from Clear Creek claim, San Benito County, California, USA in 1961.

[5] It was named to honor Californian mineral collector Lucius "Lu" Watters.

[3]