New crystal-chemical data on zincoberaunite from Krásno near
Horní Slavkov (Czech Republic)

J 2020

New crystal-chemical data on zincoberaunite from Krásno near Horní Slavkov (Czech Republic)

TVRDÝ, Jaromír, Jakub PLÁŠIL a Radek ŠKODA

Základní údaje

Originální název

New crystal-chemical data on zincoberaunite from Krásno near Horní Slavkov (Czech Republic)

Autoři

TVRDÝ, Jaromír (203 Česká republika, garant, domácí), Jakub PLÁŠIL (203 Česká republika) a Radek ŠKODA (203 Česká republika, domácí)

Vydání

Journal of Geosciences, Czech Geological Society, 2020, 1802-6222

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.525

Kód RIV

RIV/00216224:14310/20:00115539

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.3190/jgeosci.296

UT WoS

000525954600006

Klíčová slova anglicky

zincoberaunite; phosphate; crystal structure; Raman spectra; Krásno near Horní Slavkov; Czech Republic

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 30. 11. 2020 11:05, Mgr. Marie Šípková, DiS.

Anotace

V originále

A study of zincoberaunite from Krásno near Horní Slavkov (Czech Republic) provided new chemical and structural data of this rare member of the beraunite group. The studied material is monoclinic, space group C2/c. Based on refined site occupancies and bond-valence considerations, the structural formula is (Zn0.81Al0.19)(OH)2(Fe0.61Al0.39)(OH)2(H2O)2(Fe1.52Al0.48)(H2O)2(Fe1.72Al0.28)(OH)(PO4)3.83(AsO4)0.17(H2O)2. Electron-microprobe analyses support the obtained results. However, keeping the same cation occupancy at the M2–M4 sites, the ratio of Al3+ to Me2+ at the M1 site requires the presence of divalent cations as follows: (Zn0.57Fe0.24Al0.19)1.00(Fe3.85Al1.15)5.00[(PO4)3.89(AsO4)0.10(SiO4)0.01]4.00[(OH)4.59F0.24 O0.17]5.00(OH2)4.00·2H2O. Individual prismatic zincoberaunite crystals exhibit a chemical zonation manifested by increasing Fe and decreasing Zn and Al contents from cores to rims. The mineral composition is close to the Zn–Al-rich members of the beraunite group known from the same locality, but in this case, dominant occupancy of Zn at the M1 site was confirmed. With its increased aluminium content, zincoberaunite from Krásno differs significantly from the holotype specimen described from Hagendorf South pegmatite in Germany. The most prominent Raman bands are in good agreement with data published for related members of the beraunite group. Structure refinement (R = 3.56 % for 1906 observed unique reflections) revealed three different types of OH or H2O, which play distinct role in structure bonding.

Návaznosti

MUNI/A/1387/2018, interní kód MU

Název: Geologické a geoenvironmentální procesy východního okraje Českého masívu a jejich vývoj. (Akronym: GEOPROC)

Investor: Masarykova univerzita, Geologické a geoenvironmentální procesy východního okraje Českého masívu a jejich vývoj., DO R. 2020_Kategorie A - Specifický výzkum - Studentské výzkumné projekty

Citovat

TVRDÝ, Jaromír, Jakub PLÁŠIL a Radek ŠKODA. New crystal-chemical data on zincoberaunite from Krásno near Horní Slavkov (Czech Republic). Journal of Geosciences. Czech Geological Society, 2020, roč. 65, č. 1, s. 45-57. ISSN 1802-6222. Dostupné z: https://dx.doi.org/10.3190/jgeosci.296.

@article{1646236,
   author = {Tvrdý, Jaromír and Plášil, Jakub and Škoda, Radek},
   article_number = {1},
   doi = {http://dx.doi.org/10.3190/jgeosci.296},
   keywords = {zincoberaunite; phosphate; crystal structure; Raman spectra; Krásno near Horní Slavkov; Czech Republic},
   language = {eng},
   issn = {1802-6222},
   journal = {Journal of Geosciences},
   title = {New crystal-chemical data on zincoberaunite from Krásno near Horní Slavkov (Czech Republic)},
   url = {http://www.jgeosci.org/detail/jgeosci.296},
   volume = {65},
   year = {2020}
}

TY  - JOUR
ID  - 1646236
AU  - Tvrdý, Jaromír - Plášil, Jakub - Škoda, Radek
PY  - 2020
TI  - New crystal-chemical data on zincoberaunite from Krásno near Horní Slavkov (Czech Republic)
JF  - Journal of Geosciences
VL  - 65
IS  - 1
SP  - 45-57
EP  - 45-57
PB  - Czech Geological Society
SN  - 18026222
KW  - zincoberaunite
KW  - phosphate
KW  - crystal structure
KW  - Raman spectra
KW  - Krásno near Horní Slavkov
KW  - Czech Republic
UR  - http://www.jgeosci.org/detail/jgeosci.296
L2  - http://www.jgeosci.org/detail/jgeosci.296
N2  - A study of zincoberaunite from Krásno near Horní Slavkov (Czech Republic) provided new chemical and structural data of this rare member of the beraunite group. The studied material is monoclinic, space group C2/c. Based on refined site occupancies and bond-valence considerations, the structural formula is (Zn0.81Al0.19)(OH)2(Fe0.61Al0.39)(OH)2(H2O)2(Fe1.52Al0.48)(H2O)2(Fe1.72Al0.28)(OH)(PO4)3.83(AsO4)0.17(H2O)2. Electron-microprobe analyses support the obtained results. However, keeping the same cation occupancy at the M2–M4 sites, the ratio of Al3+ to Me2+ at the M1 site requires the presence of divalent cations as follows: (Zn0.57Fe0.24Al0.19)1.00(Fe3.85Al1.15)5.00[(PO4)3.89(AsO4)0.10(SiO4)0.01]4.00[(OH)4.59F0.24 O0.17]5.00(OH2)4.00·2H2O. Individual prismatic zincoberaunite crystals exhibit a chemical zonation manifested by increasing Fe and decreasing Zn and Al contents from cores to rims. The mineral composition is close to the Zn–Al-rich members of the beraunite group known from the same locality, but in this case, dominant occupancy of Zn at the M1 site was confirmed. With its increased aluminium content, zincoberaunite from Krásno differs significantly from the holotype specimen described from Hagendorf South pegmatite in Germany. The most prominent Raman bands are in good agreement with data published for related members of the beraunite group. Structure refinement (R = 3.56 % for 1906 observed unique reflections) revealed three different types of OH or H2O, which play distinct role in structure bonding.
ER  -

TVRDÝ, Jaromír, Jakub PLÁŠIL a Radek ŠKODA. New crystal-chemical data on zincoberaunite from Krásno near Horní Slavkov (Czech Republic). \textit{Journal of Geosciences}. Czech Geological Society, 2020, roč.~65, č.~1, s.~45-57. ISSN~1802-6222. Dostupné z: https://dx.doi.org/10.3190/jgeosci.296.

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