Horákite, a new hydrated bismuth uranyl-arsenate-phosphate mineral from Jáchymov (Czech Republic) with a unique uranyl-anion topology

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F18%3A10134317" target="_blank" >RIV/00023272:_____/18:10134317 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/18:00497029 RIV/00216224:14310/18:00106223

Result on the web

<a href="http://dx.doi.org/10.3190/jgeosci.267" target="_blank" >http://dx.doi.org/10.3190/jgeosci.267</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3190/jgeosci.267" target="_blank" >10.3190/jgeosci.267</a>

Result language

angličtina

Original language name

Horákite, a new hydrated bismuth uranyl-arsenate-phosphate mineral from Jáchymov (Czech Republic) with a unique uranyl-anion topology

Original language description

Horakite, ideally (Bi7O7OH)[(UO2)(4)(PO4)(2)(AsO4)(2)(OH)(2)] center dot 3.5H(2)O, is a new uranyl mineral discovered on a specimen originating from Jachymov, Czech Republic (most probably from the Geister vein, Rovnost mine). It occurs as a supergene alteration mineral in association with phosphuranylite (overgrowing older metatorbernite-metazeunerite) in a quartz gangue with abundant tennantite. Horakite forms greenish-yellow to pale yellow prismatic crystals clustering to acicular aggregates, up to 1 mm across. Crystals are transparent to translucent with a vitreous luster. The mineral has a light yellow streak. Estimated Mohs&apos; hardness is similar to 2. The cleavage is perfect on {100}. The calculated density is 6.358 g/cm(3). Horakite is optically biaxial (+), alpha approximate to 1.81, beta approximate to 1.84, gamma approximate to 1.88 (measured in white light); 2V(obs.) is 78(1)degrees, 2V(calc.) is 83 degrees; non-pleochroic. The optical orientation is X = b, X approximate to c. Electron-microprobe analysis yielded the empirical formula (Bi7.01Pb0.14)O7OH[U1.01O2)(4)(P1.03O4)(2)(As0.74Si0.23O4)(2)(OH)(2)]center dot 3.5H(2)O based on 37.5 O apfu. Horakite is monoclinic, C2/c, a = 21.374(2), b = 15.451(3), c = 12.168(2) angstrom, beta = 122.26(1)degrees and V= 3398.1(10) angstrom(3), Z = 4. The eight strongest X-ray powder-diffraction lines are [d(obs) angstrom(I)(hkl)]: 11.77(100)(110), 6.21(23)(-202), 5.55(23)(310, -112), 4.19(27)(-331), 3.54(61)(510, -423), 3.29(20)(331), 3.14(58)(241, 023) and 3.02(98)(150, 113, -533, mult.). The mineral is named after Frantisek Horak (1882-1919), the mining engineer in Jachymov, and his grandson, Vladimir Horak (born 1964), an amateur mineralogist and expert on the mining history of the Jachymov ore district.

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

<a href="/en/project/GA17-09161S" target="_blank" >GA17-09161S: Crystal structures, chemistry and stability of arsenate and sulfate minerals</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

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

Name of the periodical

Journal of Geosciences

ISSN

1802-6222

e-ISSN

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Volume of the periodical

63

Issue of the periodical within the volume

3

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

12

Pages from-to

265-276

UT code for WoS article

000447813900004

EID of the result in the Scopus database

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