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Formula: Hg2+3(Cr6+O4)S2
Anhydrous chromate of mercury
Crystal System: Monoclinic
Specific gravity: 7.11 calculated
Streak: Yellow
Colour: Canary yellow to orangish yellow
Photosensitive, turning olive-green after several months' exposure
Environments
Metamorphic environments
Hydrothermal environments
Although edoylerite was approved in 1987, to date (February 2023) it has been reported only from the type
locality.
Localities
At the type locality, the Clear Creek claim, Goat Mountain, New Idria Mining District, San Benito county, California,
USA, the mercury mineralisation is in hydrothermally altered
serpentinite, and the list of identified
mercury minerals includes cinnabar,
elemental mercury,
edgarbaileyite,
metacinnabar, montroydite,
eglestonite, calomel,
edoylerite, wattersite,
gianellaite, mosesite,
deanesmithite and
szymańskiite
(CM 37.113-118).
Edoylerite formed as an alteration product of corroded cinnabar.
Associated minerals include cinnabar,
quartz, chalcedony,
magnesite and deanesmithite
(AM 79.1009-1010, Mindat).
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