Gurzhiite, Al(UO2)(SO4)(2)F center dot 10H(2)O, a new uranyl sulfate mineral with a chain structure from the Bykogorskoe deposit, Northern Caucasus, Russia
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F22%3A00127768" target="_blank" >RIV/00216224:14310/22:00127768 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1180/mgm.2022.34" target="_blank" >https://doi.org/10.1180/mgm.2022.34</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1180/mgm.2022.34" target="_blank" >10.1180/mgm.2022.34</a>
Alternative languages
Result language
angličtina
Original language name
Gurzhiite, Al(UO2)(SO4)(2)F center dot 10H(2)O, a new uranyl sulfate mineral with a chain structure from the Bykogorskoe deposit, Northern Caucasus, Russia
Original language description
Gurzhiite, ideally Al(UO2)(SO4)(2)F center dot 10H(2)O, is a new uranyl sulfate mineral from the Bykogorskoe U deposit, Northern Caucasus, Russia. It occurs as fine-grained aggregates forming veinlets up to 50 cm long in cracks of the brecciated rock. Gurzhiite aggregates are composed of small bladed crystals up to 0.1 mm across. Associated minerals include khademite and quartz. Gurzhiite is pale yellow in crystals, lemon yellow in aggregates, transparent with a vitreous lustre and a white streak. It is brittle and has an irregular fracture. Cleavage is good on {001}. The new mineral exhibits a bright yellow-green fluorescence under both longwave and shortwave UV radiation. Mohs hardness is similar to 2. D-meas = 2.52(3) g/cm(3) and D-calc = 2.605 g/cm(3). The mineral is biaxial (-) with alpha = 1.528(3), beta = 1.538(2), gamma = 1.544(3) (589 nm); 2V(meas) = 80(10)degrees and 2V(calc) = 75.1 degrees. The empirical formula calculated on the basis of 21(O + F) atoms per formula unit (apfu) is Al0.92Zn0.05Fe0.033+Na0.03U0.95S2.00O9.85F0.99 center dot 10.16H(2)O. Gurzhiite is triclinic, with space group P (1) over bar, a = 7.193(2), b = 11.760(2), c = 11.792(2) angstrom, alpha = 67.20(3), beta = 107.76(3), gamma = 89.99(3)degrees, V = 867.7(4) angstrom(3) and Z = 2. The five strongest lines of the powder X-ray diffraction pattern [d, angstrom (I, %)(hkl)] are: 10.24(100)(001); 5.40(14)((1) over bar(1) over bar1); 5.11(54)(002); 3.405(11)((2) over bar 11); and 3.065(11)((1) over bar(1) over bar3). The crystal structure of gurzhiite is based upon uranyl sulfate chains of the same type as in bobcookite and svornostite. Between the chains are two types of Al-octahedra - Al1(H2O)(6) and Al2F(2)(H2O)(4). The entire structure stability is maintained by a complex network of H bonds. The new mineral honours Russian mineralogist and crystallographer Dr. Vladislav V. Gurzhiy in recognition for his contributions to uranium mineralogy and crystallography.
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
<a href="/en/project/EF16_026%2F0008459" target="_blank" >EF16_026/0008459: Long-term research of geochemical barriers for nuclear waste disposal</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
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
1471-8022
Volume of the periodical
86
Issue of the periodical within the volume
3
Country of publishing house
GB - UNITED KINGDOM
Number of pages
10
Pages from-to
412-421
UT code for WoS article
000800690600001
EID of the result in the Scopus database
2-s2.0-85130566957