| Reference Type | Journal (article/letter/editorial) |
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| Title | Shannonite, Pb2OCO3, a new mineral from the Grand Reef Mine, Graham County, Arizona, USA |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Roberts, A. C. | Author |
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| Stirling, J. A. R. | Author |
| Carpenter, G. J. C. | Author |
| Criddle, A. J. | Author |
| Jones, G. C. | Author |
| Birkett, T. C. | Author |
| Birch, W. D. | Author |
| Year | 1995 (June) | Volume | 59 |
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| Issue | 395 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_59/59-395-305.pdf+ |
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| DOI | doi:10.1180/minmag.1995.059.395.14Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 2646 | Long-form Identifier | mindat:1:5:2646:2 |
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| GUID | 0 |
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| Full Reference | Roberts, A. C., Stirling, J. A. R., Carpenter, G. J. C., Criddle, A. J., Jones, G. C., Birkett, T. C., Birch, W. D. (1995) Shannonite, Pb2OCO3, a new mineral from the Grand Reef Mine, Graham County, Arizona, USA. Mineralogical Magazine, 59 (395) 305-310 doi:10.1180/minmag.1995.059.395.14 |
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| Plain Text | Roberts, A. C., Stirling, J. A. R., Carpenter, G. J. C., Criddle, A. J., Jones, G. C., Birkett, T. C., Birch, W. D. (1995) Shannonite, Pb2OCO3, a new mineral from the Grand Reef Mine, Graham County, Arizona, USA. Mineralogical Magazine, 59 (395) 305-310 doi:10.1180/minmag.1995.059.395.14 |
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| In | (1995, June) Mineralogical Magazine Vol. 59 (395) Mineralogical Society |
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| Abstract/Notes | Shannonite, ideally Pb2OCO3, is a new mineral species that occurs as mm-sized white porcellanous crusts, associated with fluorite, at the Grand Reef mine, Graham County, Arizona, USA. Other associated minerals are plumbojarosite, hematite, Mn-oxides, muscovite-2M1, quartz, litharge, massicot, hydrocerussite, minium, and unnamed PbCO3·2PbO. Shannonite is orthorhombic, space group P21221 or P212121, with unit-cell parameters (refined from X-ray powder data): a 9.294(3), b 9.000(3), c 5.133(2) Å, V 429.3(3) Å3, a:b:c 1.0327:1:0.5703, Z = 4. The strongest five lines in the X-ray powder pattern [d in Å (I)(hkl)] are: 4.02(40)(111); 3.215(100)(211); 3.181(90)(121); 2.858(40)(130); 2.564(35)(002). The average of eight electron microprobe analyses is PbO 89.9(5), CO2 (by CHN elemental analyser) 9.70, total 99.60 wt.%. With O = 4, the empirical formula is Pb1.91C1.05O4.00. The calculated density for the empirical formula is 7.31 and for the idealized formula is 7.59 g/cm3. In reflected light, shannonite is colourless-grey to white, with ubiquitous white internal reflections (× 16 objectives), weak anisotropy, barely detectable bireflectance, and no evidence of pleochroism. The calculated refractive index (at 590 nm) is 2.09. Measured reflectance values in air and in oil (× 4 objectives) are tabulated. Transmission electron-microscopy studies reveal that individual crystallites range in size from 10–400 nm, are platy, and are anhedral. Physical properties for cryptocrystalline crusts include: white streak; waxy lustre; opaque; nonfluorescent under both long- and short-wave ultraviolet light; uneven fracture; brittle; VHN100 97 (range 93–100); calculated Mohs’ hardness 3–3½. Shannonite is soluble in concentrated HCl and in dilute HNO3 and H2SO4. The mineral name is for David M. Shannon, who helped collect the samples and who initiated this study. |
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