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TEDHADLEYITE, Hg²⁺Hg¹⁺₁₀O₄I₂(Cl,Br)₂, A NEW MINERAL SPECIES FROM THE CLEAR CREEK CLAIM, SAN BENITO COUNTY, CALIFORNIA

Andrew C. Roberts^1,, Mark A. Cooper², Frank C. Hawthorne², Alan J. Criddle^3,, John A.R. Stirling⁴ and Gail E. Dunning⁵

¹ Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
² Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
³ Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, U.K.
⁴ Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
⁵ 773 Durshire Way, Sunnyvale, California 94087, U.S.A.

E-mail address: aroberts{at}NRCan.gc.ca

Tedhadleyite, a new mineral species of ideal composition Hg²⁺Hg¹⁺₁₀O₄I₂(Cl,Br)₂, is triclinic, A , with unit-cell parameters refined from X-ray powder data: a 7.014(4), b 11.855(6), c 12.601(6) Å, 115.56(4), ß 82.57(4), 100.57(4)°, V 927.7(8) ų, a:b:c 0.5916:1:1.0629, Z = 2. The strongest eight lines of the X-ray powder-diffraction pattern [d in Å(I)(hkl)] are: 5.281(50)(020,1), 3.143(90)(1,22), 3.005(70)(22), 2.981(50)(211), 2.885(100)(113), 2.675(90)(4, 23, 131), 2.508(40)(3) and 1.624(35)(035). The mineral occurs on a single specimen collected from a small prospect pit near the long-abandoned Clear Creek mercury mine, New Idria district, San Benito County, California. It is most closely associated with native mercury, calomel and traces of cinnabar, eglestonite and montroydite in a host rock principally composed of quartz and magnesite. Tedhadleyite occurs in a quartz-lined vug as a somewhat elongate spheroidal anhedral mass, 0.3 mm in diameter, which is partly hollow. The mineral is very dark red to black with a red streak. Physical properties include: adamantine to submetallic luster, opaque to translucent (on thin edges), nonfluorescent, poor {010} cleavage, brittle, uneven fracture, hardness less than 3, calculated density 9.43 g/cm³ (for the chemical formula and unit-cell parameters derived from the crystal structure). In polished section, tedhadleyite is very weakly bireflectant, nonpleochroic and moderately anisotropic in shades of grey. In reflected plane-polarized light, it is bluish white with ubiquitous deep red to purplish red internal reflections. Measured reflectance values obtained in air and in oil for a single fragment are tabulated. Averaged and corrected results of electron-microprobe analyses yielded HgO 8.36, Hg₂O 80.50, I 11.11, Cl 2.20, Br 1.62, sum 103.79, less O = I + Cl + Br 1.36, total 102.43 wt.%, corresponding to Hg_1.0²⁺Hg¹⁺_9.8O_3.7I_2.2(Cl_1.6Br_0.5)_2.1, based on O + I + Cl + Br = 8 apfu (atoms per formula unit). The original value for Hg, 85.15 wt.%, was partitioned in a ratio of 1 HgO : 10 Hg₂O after the crystal structure was determined. The mineral name honors Ted A.Hadley of Sunnyvale, California.

Keywords: tedhadleyite, new mineral species, mercurous mercuric oxide iodide chloride bromide, X-ray data, electron-microprobe data, reflectance data, Clear Creek mine, San Benito County, California.

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