| Reference Type | Journal (article/letter/editorial) |
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| Title | Twinning and incommensurate modulation in baumoite, Ba0.5[(UO2)3O8Mo2(OH)3](H2O)~3, the first natural Ba uranyl molybdate |
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| Journal | Mineralogical Magazine |
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| Authors | Elliott, Peter | Author |
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| Plášil, Jakub | Author |
| Petříček, Václav | Author |
| Čejka, Jiří | Author |
| Bindi, Luca | Author |
| Year | 2019 (August) | Volume | 83 |
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| Issue | 4 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM83_507.pdf+ |
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| DOI | doi:10.1180/mgm.2019.20Search 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 | 245166 | Long-form Identifier | mindat:1:5:245166:8 |
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| GUID | 0 |
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| Full Reference | Elliott, Peter, Plášil, Jakub, Petříček, Václav, Čejka, Jiří, Bindi, Luca (2019) Twinning and incommensurate modulation in baumoite, Ba0.5[(UO2)3O8Mo2(OH)3](H2O)~3, the first natural Ba uranyl molybdate. Mineralogical Magazine, 83 (4) 507-514 doi:10.1180/mgm.2019.20 |
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| Plain Text | Elliott, Peter, Plášil, Jakub, Petříček, Václav, Čejka, Jiří, Bindi, Luca (2019) Twinning and incommensurate modulation in baumoite, Ba0.5[(UO2)3O8Mo2(OH)3](H2O)~3, the first natural Ba uranyl molybdate. Mineralogical Magazine, 83 (4) 507-514 doi:10.1180/mgm.2019.20 |
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| In | (2019, August) Mineralogical Magazine Vol. 83 (4) Mineralogical Society |
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| Abstract/Notes | Baumoite, Ba0.5[(UO2)3O8Mo2(OH)3](H2O)~3, is a new mineral found near Radium Hill, South Australia, where it occurs in a granite matrix associated with baryte, metatorbernite, phurcalite and kaolinite. Baumoite forms thin crusts of yellow to orange–yellow tabular to prismatic crystals. The mineral is translucent with a vitreous lustre and pale yellow streak. Crystals are brittle, the fracture is uneven and show one excellent cleavage. The Mohs hardness is ~2½. The calculated density is 4.61 g/cm3. Optically, baumoite crystals are biaxial (–), with α = 1.716(4), β = 1.761(4), γ = 1.767(4) (white light); and 2Vcalc = 42.2°. Electron microprobe analyses gave the empirical formula Ba0.87Ca0.03Al0.04U2.97Mo2.02P0.03O22H11.99, based on 22 O atoms per formula unit. The eight strongest lines in the powder X-ray diffraction pattern are [dobs Å (I) (hkl)]: 9.175(39)(12${\bar 1}$), 7.450(100)(020), 3.554(20)(221), 3.365(31)(004, 202), 3.255(31)(123, 30${\bar 2}$), 3.209(28)(12${\bar 4}$), 3.067(33)(30${\bar 3}$, 222, 32${\bar 2}$) and 2.977(20)(142). Single-crystal X-ray studies (R1 = 5.85% for 1892 main reflections) indicate that baumoite is monoclinic, superspace group X2/m(a0g)0s with X = (0,½,0,½), with unit-cell parameters: a = 9.8337(3), b = 15.0436(5), c = 14.2055(6) Å, β = 108.978(3)°, V = 1987.25(13) Å3 and Z = 4. The crystal structure is twinned and incommensurately modulated and is based upon sheets of U6+ and Mo6+ polyhedra of unique topology. Four independent cationic sites partially occupied by Ba atoms are located between the sheets, together with H2O molecules. |
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