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

Kód výsledku v 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>

Nalezeny alternativní kódy

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

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

<a href="/cs/project/GA17-09161S" target="_blank" >GA17-09161S: Krystalové struktury, chemismus a stabilita arseničnanových a síranových minerálů</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Journal of Geosciences

ISSN

1802-6222

e-ISSN

—

Svazek periodika

63

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

12

Strana od-do

265-276

Kód UT WoS článku

000447813900004

EID výsledku v databázi Scopus

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