eglestonite

eglestonite

[′eg·əl·stə‚nīt]
(mineralogy)
Hg4Cl2O Rare mercuric oxide mineral; forms yellow-brown isometric crystals upon exposure to air.
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Other mercury-bearing minerals identified from the mineralized veins include montroydite, schuetteite, calomel, gianellaite, mosesite, terlinguaite, eglestonite, metacinnabar, cinnabar, native mercury and the second world occurrence of donharrisite.
Eglestonite occurs as deeply striated cubic and dodecahedral crystals with a blocky habit, and as thinly elongated spears with apparent twinning.
It is generally associated with cinnabar, edgarbaileyite, eglestonite, montroydite, mosesite, szymanskiite and wattersite.
It is most commonly observed covering or attached to wattersite, native mercury, edgarbaileyite, eglestonite and cinnabar.
It generally occurs as dark-brown masses of subhedral crystals, although at least two euhedral, prismatic crystals have been found associated with eglestonite and montroydite in the lower workings.
Other mercury minerals with structures most resembling that of vasilyevite are poyarkovite, [[Hg.sub.2]]OCl, and eglestonite, [[Hg.sub.2]][.sub.3][Cl.sub.3][O.sub.2]H, although the additional topological complexity of vasilyevite arises from the fact that polymerization in the c direction involves a crankshaft configuration rather than a linear motif.
Wattersite is commonly associated with native mercury, edgarbaileyite, montroydite and eglestonite. It is one of the few minerals from the mine that is well crystallized, occurring as sharp crystals with a bright metallic luster, often as single or multiple groups.
Subsequent to this initial mineralization, small amounts of montroydite, eglestonite, wattersite, deanesmithite, edoylerite, edgarbaileyite, CCUK-8, and szymanskiite formed.
Here, the opalized serpentinite rocks contain thin coatings and veins of cinnabar with isolated native mercury and small quantities of eglestonite and edgarbaileyite.
Mercury minerals identified from the lower workings that probably formed after the cinnabar include eglestonite, hanawaltite, peterbaylissite, clearcreekite, calomel, terlinguaite, wattersite, edoylerite, deanesmithite, szymanskiite, and seven unnamed minerals.
When these mineralized silica veins are opened, they often reveal abundant native mercury and cinnabar, with minor edgarbaileyite, eglestonite, montroydite and wattersite filling irregular cavities.
Occurrence: In fractures in the Jackfork sandstone with cinnabar, quartz and dickite and other mercury minerals (calomel, eglestonite, mercury, metacinnabar, montroydite, terlinguaite).