New Minerals from the Redmond Mine, North Carolina, USA: III. Cherokeeite and Cuprocherokeeite, Two New Minerals Containing [Pb2(Zn,Cu2+)(OH)4]2+ Chains
Author:
Kampf Anthony R.1, Smith Jason B.2, Hughes John M.3, Ma Chi4, Emproto Christopher5
Affiliation:
1. Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA 2. 2148 McClintock Rd., Charlotte, North Carolina 28205, USA 3. Department of Geology, University of Vermont, Burlington, Vermont 05405, USA 4. Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA 5. Department of Earth and Environmental Sciences, University of Michigan, 1100 North University Avenue, Ann Arbor, Michigan 48109, USA
Abstract
Abstract
The new minerals cherokeeite, [Pb2Zn(OH)4](SO4)·H2O (IMA2022-016), and cuprocherokeeite, [Pb8Zn3Cu2+(OH)16](SO4)4·4H2O (IMA2022-086), were found in the Redmond mine, Haywood County, North Carolina, USA, where they occur together in a highly unusual secondary assemblage that comprises a variety of rare Pb-Zn-Cu sulfates, thiosulfates, and carbonates. Cherokeeite has the following properties: colorless to pale pink prisms or blades to about 1 mm; white streak; vitreous luster; brittle; Mohs hardness 2½; splintery fracture; at least two perfect cleavages; 5.011 g/cm3 calculated density; biaxial (+) with α = 1.745(5), β = 1.770(5), γ = 1.805(5), and 2V = 85(2)°. Cuprocherokeeite has the following properties: light blue prisms or blades to about 1 mm; very pale bluish-white streak; vitreous luster; brittle; Mohs hardness 2½; irregular, curved fracture; probably two good cleavages; 5.032 g/cm3 calculated density; biaxial (+) with α = 1.760(5), β = 1.770(5), γ = 1.800(5), and 2V (meas.) = 65(3)°. Electron probe microanalyses provided the empirical formulae [Pb2.00Zn1.00(OH)4](SO4)0.85(S2O3)0.15·H2O and [Pb8.14(Zn2.52Cu2+1.34)(OH)16][(SO4)3.07(S2O3)0.93]·4H2O for cherokeeite and cuprocherokeeite, respectively. Cherokeeite is monoclinic, P21/n, a = 17.1697(7), b = 6.47173(19), c = 17.5304(12) Å, β = 115.440(8)°, V = 1759.06(19) Å3, and Z = 8. Cuprocherokeeite is monoclinic, P21/n, a = 12.6828(5), b = 9.4629(5), c = 14.7876(8) Å, β = 94.798(4)°, V = 1768.53(15) Å3, and Z = 2. The structures of cherokeeite (R1 = 0.0425 for 2681 I > 2σI) and cuprocherokeeite (R1 = 0.0741 for 2411 I > 2σI) both contain edge-sharing chains of octahedra decorated by Pb2+ cations, which are strongly bonded to the chains via short Pb–O bonds. In cherokeeite, the octahedral cations are all Zn, whereas in cuprocherokeeite, one in every four cations is Cu2+.
Publisher
Mineralogical Association of Canada
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