Extending the mineralogy of U6+ (II.): Barronite, a new uranyl silicate related to weeksite from Menzenschwand, Germany

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F25%3A10137000" target="_blank" >RIV/00023272:_____/25:10137000 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/25:00642224 RIV/00216224:14310/25:00143382

Result on the web

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/extending-the-mineralogy-of-u6-ii-barronite-a-new-uranyl-silicate-related-to-weeksite-from-menzenschwand-germany/D106344EBF030690EA74FDDEFF894202" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/extending-the-mineralogy-of-u6-ii-barronite-a-new-uranyl-silicate-related-to-weeksite-from-menzenschwand-germany/D106344EBF030690EA74FDDEFF894202</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2025.10081" target="_blank" >10.1180/mgm.2025.10081</a>

Result language

angličtina

Original language name

Extending the mineralogy of U6+ (II.): Barronite, a new uranyl silicate related to weeksite from Menzenschwand, Germany

Original language description

The new mineral barronite (IMA 2024-053), (□1.5Ba0.5)2(UO2)2Si5O12(OH).2H2O, was found in the material from Menzenschwand uranium deposit, Black Forest Mts., Germany, where it occurs as globular/acicular aggregates, consisting of long-prismatic crystals, up to 0.3 mm in length, in baryte and quartz-based gangue. Barronite is not associated with any other supergene minerals. Crystals are pale yellow with colourless to pale yellow streak. Nevertheless, some of the crystals have a brown-orange tint, caused by Fe-Si-gels. The tenacity is brittle, the Mohs hardness is 1-2. The mineral has distinct cleavage on {100}; the fracture is uneven. Barronite is biaxial (+), with α = 1.599(2), β = 1.607(2), γ = 1.617(3); 2V (meas.) = 86o. Optical orientation is X = b, Y ˄ a ~3o in the obtuse angle β. Dispersion is distinct r&gt;v. Pleochroism is distinct in hues of pale-yellow X&lt;Y&lt;Z. Electron microprobe analyses provided (based on 19 O atoms) (□1.369Ba0.345K0.165Ca0.086Pb0.024Fe0.011)Σ2.000(U0.996O2)2Si4.989O12(OH).2H2O Barronite is monoclinic, C2/m, a = 14.2115(11) Å, b = 14.0169(19) Å, c = 9.6545(8) Å, β = 111.59(6)o, with V = 1788.2(8) Å3 (Z = 4), refined from the corrected 3D ED data at 94K. The crystal structure refinement (R1 = 0.0791 for 6596 [I &gt; 3(I)] reflections) refined from the 3D ED data confirmed that barronite has the same structural architecture as weeksite; however, it contains less H2O in the channels of the uranyl-silicate framework structure.

Czech name

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Czech description

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Type

J_imp - 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

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

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Volume of the periodical

89

Issue of the periodical within the volume

5

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

638-649

UT code for WoS article

001616164600001

EID of the result in the Scopus database

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