Yellow acicular crystals of the very rare mercury mineral edoylerite from the Clear Ceek mine (Clear Creek Claim, Goat Mountain, New Idria, San Benito County, California, United States of America), famous for its paragenesis of very rare Hg minerals, associated to red cinnabar. Edoylerite is a mercury chromate. Ex.Dr Hartel collection. — Photo: David Hospital · CC BY-SA 4.0
Edoylerite
A rare mercury chromate discovered in 1961 at the Clear Creek claim in San Benito County, California — named for its finder Edward Oyler.
Intro adapted from Wikipedia (CC BY-SA).
Edoylerite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Hg²⁺₃(Cr⁶⁺O₄)S₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: specific gravity 7.11; Yellow streak; Adamantine luster; optically biaxial.
IMA symbol Eoy, IMA status: approved, named in 1987.
A rare alteration product of cinnabar, in a mercury deposit in silicate–carbonate rock hydrothermally altered from serpentinite.
It is found associated with Cinnabar, deanesmithite, ferroan magnesite, quartz.
The mineral was named to honor Edward H. Oyler (1915–), American mineral collector specializing in mercury minerals.