From: Geology, Mining History, Mineralogy, and Paragenesis of the McDermitt Caldera Complex, Opalite Mining District, Humboldt County, Nevada, and Malheur County, Oregon.
Dunning, G.E., Cox, M.F., Christy, A.G., Hadley, T.A., Marty, J.
Bay Area Mineralogists Report, Baymin Journal (2019) 20(4), 168 pp.
Summary
Several dull cream-colored micro crystal groups were noted within quartz-lined cavities in a cinnabar and corderoite-rich breccia collected from Area 1. A PXRD of this crystal group did not match any known phase. An EDS of a crystal group gave major Hg, S and oxygen with values of 71.57% HgO and 28.43% SO3, giving HgSO4. Subsequent structure analysis has indicated that Mo occurs in the structure and the formula has been revised to reflect the Mo [(Hg2+)3S2-2[MoO4]]. This same phase was noted filling micro voids within the same breccia. A SEM photomicrograph of these groups revealed they are compose of a mass of elongated crystals with sloped terminations. The crystals have average dimensions of 10um x 1um x 0.05um. Figures 158 through 161 illustrate this new mercury phase. A preliminary structure determination of a single crystal (R=3%) gave an orthorhombic-P cell in space group Pmnb with a = 6.97Å, b = 8.03Å, c = 12.97Å. Z = 4.