| Reference Type | Journal (article/letter/editorial) |
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| Title | Molybdomenite-P21/c, Polymorphous with Molybdomenite and the Natural Analogue of Synthetic α-PbSe4+O3, from the El Dragón Mine, Potosí, Bolivia |
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| Journal | The Canadian Journal of Mineralogy and Petrology |
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| Authors | Zhang, Jingnan | Author |
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| Yang, Hexiong | Author |
| Gibbs, Ronald B. | Author |
| Year | 2024 (July) | Volume | 62 |
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| Page(s) | 643-652 | Issue | 4 |
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| URL | |
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| DOI | doi:10.3749/2400004Search in ResearchGate |
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| Generate Citation Formats |
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| Original Entry | Zhang, J., Yang, H., Gibbs, R.B. (2024): Molybdomenite-P21/c, Polymorphous with Molybdomenite and the Natural Analogue of Synthetic α-PbSe4+O3, from the El Dragón Mine, Potosí, Bolivia. The Canadian Journal of Mineralogy and Petrology, 62, (in press). |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17447439 | Long-form Identifier | mindat:1:5:17447439:7 |
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| GUID | 0 |
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| Full Reference | Zhang, Jingnan; Yang, Hexiong; Gibbs, Ronald B. (2024) Molybdomenite-P21/c, Polymorphous with Molybdomenite and the Natural Analogue of Synthetic α-PbSe4+O3, from the El Dragón Mine, Potosí, Bolivia. The Canadian Journal of Mineralogy and Petrology, 62 (4). 643-652 doi:10.3749/2400004 |
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| Plain Text | Zhang, Jingnan; Yang, Hexiong; Gibbs, Ronald B. (2024) Molybdomenite-P21/c, Polymorphous with Molybdomenite and the Natural Analogue of Synthetic α-PbSe4+O3, from the El Dragón Mine, Potosí, Bolivia. The Canadian Journal of Mineralogy and Petrology, 62 (4). 643-652 doi:10.3749/2400004 |
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| In | (2024, July) The Canadian Journal of Mineralogy and Petrology Vol. 62 (4). Mineralogical Association of Canada |
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| Abstract/Notes | A polymorph of PbSe4+O3, designated as molybdomenite-P21/c, has been discovered from the El Dragón mine, Potosí Department, Bolivia. It occurs as thin-bladed crystals. Associated minerals are Co-bearing krut’aite–penroseite, chalcomenite, and dolomite. Molybdomenite- P21/c is pale yellow in transmitted light and has a greasy luster. It is brittle and has a Mohs hardness of 3. No cleavage was observed. The calculated density is 7.034 g/cm3. An electron microprobe analysis yielded an empirical formula (based on 3 O apfu) of Pb1.00Se1.00O3.Molybdomenite-P21/c is the natural counterpart of synthetic α-PbSe4+O3, which is dimorphous with grandfathered P21/m molybdomenite (or β-PbSe4+O3). It is monoclinic with space group P21/c and unit-cell parameters a = 9.154(8), b = 8.071(6), c = 8.780(7) Å, β = 103.15(8) °, and V = 631.6(6) Å3. The crystal structure of molybdomenite-P21/c consists of two symmetrically distinct Pb (Pb1 and Pb2), two Se (Se1 an Se2), and six O atoms. Each Se4+ cation is bonded to three O atoms, forming a typical (Se4+O3)2− trigonal pyramid. Both Pb1 and Pb2 atoms are coordinated by nine O atoms. Each [PbO9] polyhedron is linked to six (SeO3)2− pyramids, three by sharing edges and three by sharing corners. The [PbO9] polyhedra are connected to one another through sharing edges and by (SeO3)2− groups, giving rise to a complex three-dimensional net system. Topologically, the crystal structure of molybdomenite-P21/c is identical to that of molybdomenite. Raman spectroscopic measurements reveal that there is only one strong peak centered at 790 cm−1, attributable to the Se4+–O symmetric stretching vibrations within the (SeO3)2− groups, for molybdomenite, whereas there are two such strong peaks, one at 788 cm−1 and the other at 804 cm−1, for molybdomenite-P21/c. |
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