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Wildcatite, CaFe3+Te6 +O5(OH), the second new tellurate mineral from the Detroit district, Juab County, Utah


Missen, OP and Mills, SJ and Kampf, AR and Coolbaugh, MF and Najorka, J and Rumsey, M and Marty, J and Spratt, J and Raudsepp, M and McCormack, JK, Wildcatite, CaFe3+Te6 +O5(OH), the second new tellurate mineral from the Detroit district, Juab County, Utah, The Canadian Mineralogist, 59, (4) pp. 729-739. ISSN 1499-1276 (2021) [Refereed Article]

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PDF (New mineral description of wildcatite, a calcium iron tellurate mineral found in the oxidation zone of tellurium-gold deposits)
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DOI: doi:10.3749/canmin.2000092


Wildcatite (IMA2020–019) is a new calcium–iron(III) tellurate discovered at the Wildcat prospect in the Detroit district, Juab County, Utah. Wildcatite may take on a variety of appearances, ranging from transparent orange to brown coatings or masses to earthy, white polycrystalline coatings filling jasperoid fracture surfaces. Coatings of wildcatite are generally less than 0.1 mm thick and may cover up to 5 cm2, while nanoscale crystallites of wildcatite may form translucent red-brown "crystals" up to 0.1 mm. Wildcatite is found associated with gold, calcite, aragonite, native tellurium, manganese oxides, iron oxides, rare clinobisvanite, beyerite, coronadite, the Te oxides paratellurite and tellurite, and the Te oxysalts andymcdonaldite, burckhardtite, carlfriesite, eckhardite, frankhawthorneite, khinite, mcalpineite, tlapallite, and xocolatlite. The strongest powder diffraction lines are [dobsÅ(Iobs)(hkl)]: 3.33(100)(011), 2.60(55)(110), 2.30(59)(111), 2.05(33)(021), and 1.80(88)(112). The average size of wildcatite crystallites is 13 nm, thus the crystal structure of wildcatite was solved by Rietveld refinement, converging to a final RB value of 3.14%. The empirical formula of wildcatite, as determined by electron probe microanalysis and Rietveld refinement, is Ca0.98Bi3+0.02Pb0.01Fe3+0.73Mg0.05Mn2+0.02Zn0.01Cu0.00Te6+1.15Sb5+0.02Si0.01O5.44H0.56, simplified to the ideal formula of CaFe3+Te6+O5(OH). Wildcatite is trigonal, crystallizing in the space group P1m, with a = 5.2003(14) Å, c = 4.9669(14) Å, V = 116.3(1) Å3 and Z = 1. Wildcatite is structurally very similar to rosiaite (PbSb2O6), possessing a honeycomb-like two-dimensional framework of edge-sharing Fe3+O6 and Te6+O6 octahedra, sandwiching octahedrally coordinated Ca2+ cations. Minor OH substitution (∼10%) at the O sites is required for charge balance in wildcatite.

Item Details

Item Type:Refereed Article
Keywords:wildcatite, new mineral, tellurate, rosiaite structure, Wildcat prospect, Detroit district, Juab County, Utah
Research Division:Earth Sciences
Research Group:Geology
Research Field:Mineralogy and crystallography
Objective Division:Mineral Resources (Excl. Energy Resources)
Objective Group:Other mineral resources (excl. energy resources)
Objective Field:Other mineral resources (excl. energy resources) not elsewhere classified
UTAS Author:Missen, OP (Dr Owen Missen)
ID Code:154969
Year Published:2021
Deposited By:CODES ARC
Deposited On:2023-01-20
Last Modified:2023-01-25

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