:Yellowish zones of edgarbaileyite along with bright red cinnabar. Dimensions: 6.6 x 4.8 x 4.1 cm. Locality: Clear Creek claim, Picacho Peak, New Idria District, Diablo Range, San Benito Co., California, USA — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Edgarbaileyite
Edgarbaileyite is an IMA-recognized mineral species in the silicate class, with the chemical formula Hg¹⁺₆Si₂O₇.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 4; specific gravity 9.4; Pale yellowish green streak; Vitreous, resinous when nodular luster; optically biaxial.
IMA symbol Ebl, IMA status: approved, named in 1988.
A secondary mineral, probably resulting from reaction between mercury and quartz under unknown conditions.
It is found associated with Mercury, cinnabar, montroydite, terlinguaite, eglestonite, calcite, quartz, barite.
The name refers to Dr. Edgar Herbert Bailey (1914–1983), distinguished geologist and mercury specialist with the U.S. Geological Survey.