Twinning and incommensurate modulation in baumoite, Ba0.5[(UO2)3O8Mo2(OH)3](H2O)(similar to 3), the first natural Ba uranyl molybdate
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F19%3A10134527" target="_blank" >RIV/00023272:_____/19:10134527 - isvavai.cz</a>
Result on the web
<a href="https://www.cambridge.org/core/services/aop-cambridge-core/content/view/CFBD0072EDC0796E0DA01A7F39B598A5/S0026461X19000203a.pdf/twinning_and_incommensurate_modulation_in_baumoite_ba05uo23o8mo2oh3h2o3_the_first_natural_ba_uranyl_molybdate.pdf" target="_blank" >https://www.cambridge.org/core/services/aop-cambridge-core/content/view/CFBD0072EDC0796E0DA01A7F39B598A5/S0026461X19000203a.pdf/twinning_and_incommensurate_modulation_in_baumoite_ba05uo23o8mo2oh3h2o3_the_first_natural_ba_uranyl_molybdate.pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1180/mgm.2019.20" target="_blank" >10.1180/mgm.2019.20</a>
Alternative languages
Result language
angličtina
Original language name
Twinning and incommensurate modulation in baumoite, Ba0.5[(UO2)3O8Mo2(OH)3](H2O)(similar to 3), the first natural Ba uranyl molybdate
Original language description
Baumoite, Ba0.5[(UO2)3O8Mo2(OH)3](H2O)(similar to 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 similar to 2 1/2. The calculated density is 4.61 g/cm3. Optically, baumoite crystals are biaxial (-), with alpha = 1.716(4), beta= 1.761(4), gamma = 1.767(4) (white light); and 2V(calc) = 42.2 degrees. 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 [d(obs )angstrom (I) (hkl)]: 9.175(39)(12-1), 7.450(100)(020), 3.554(20)(221), 3.365(31)(004, 202), 1255(31)(123, 30-2), 3.209(28)(12-4), 3.067(33)(30-3, 222, 32-2) and 2.977(20)(142). Single-crystal X-ray studies (R-1 = 5.85% for 1892 main reflections) indicate that baumoite is monoclinic, with unit-cell parameters: a = 9.8337(3), b = 15.0436(5), c = 14.2055(6) angstrom, beta = 108.978(3)degrees, V= 1987.25(13) angstrom3 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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy
Result continuities
Project
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Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Mineralogical Magazine
ISSN
0026-461X
e-ISSN
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Volume of the periodical
83
Issue of the periodical within the volume
4
Country of publishing house
GB - UNITED KINGDOM
Number of pages
8
Pages from-to
507-514
UT code for WoS article
000483896200003
EID of the result in the Scopus database
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