Julgoldite-(Fe2+) and Fe-rich prehnite from pectolite veins at Koštálov quarry, Czech Republic: Mössbauer, WDS and PXRD study

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F25%3A10136948" target="_blank" >RIV/00023272:_____/25:10136948 - isvavai.cz</a>

Result on the web

<a href="https://www.jgeosci.org/content/jgeosci.403_Vrtiska.pdf" target="_blank" >https://www.jgeosci.org/content/jgeosci.403_Vrtiska.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3190/jgeosci.403" target="_blank" >10.3190/jgeosci.403</a>

Result language

angličtina

Original language name

Julgoldite-(Fe2+) and Fe-rich prehnite from pectolite veins at Koštálov quarry, Czech Republic: Mössbauer, WDS and PXRD study

Original language description

Julgoldite-(Fe2+) and Fe-rich prehnite were found in pectolite veins filling fissures in basaltic andesite at the Košt&apos;álov quarry near Semily (Liberec region, Czech Republic). Empirical formula of julgoldite-(Fe2+) based on EPMA and Mössbauer spectroscopy considering so-called intervalence electron hopping in the structure may be written as Ca2.01(Fe2+0.56Fe2.5+0.25Mg0.14)Σ0.95(Fe3+1.19Fe2.5+0.25Al0.57)Σ2.01Si3O9.94(OH)4.06. Refined unit-cell parameters for monoclinic space group A2/m are a = 8.927(3) Å, b = 6.080(2) Å, c = 19.428(7) Å, β = 97.59(4)o, V = 1045.2(8) Å3. Prehnite with the empirical formula Ca2.01(Al0.53Fe0.45)Σ0.98(AlSi3O10)(OH)1.93F0.02 is located approximately in the middle of the prehnite-ferriprehnite series. Mössbauer spectroscopy indicated that all Fe is present in the trivalent form. The increased Fe content is also reflected in this unit-cell: a = 18.617(5) Å, b = 5.502(2) Å, c = 4.672(2) Å, V = 478.5(2) Å3. Pectolite is the main mineral in the mineral assemblage. Its unit-cell parameters refined from powder X-ray diffraction are a = 7.9848(14) Å, b = 7.0391(19) Å, c = 7.0243(11) Å, α = 90.53(2)o, β = 95.19(1)o, γ = 102.48(2)o and V 383.7(1) Å3 . Chemical composition of pectolite corresponds to ideal stoichiometry and give the empirical formula Na1.00(Ca2.02Mn0.01Fe0.01)Σ2.04Si3O8(OH1.04)F0.02. Other minor minerals of the association are hematite, pyrite and the youngest calcite. The source of mineralization of the circulating fluids can be found in alteration of rock components (feldspars, olivine, glass); however, external input from the surrounding calcareous sediments cannot be excluded.

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

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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

Journal of Geosciences

ISSN

1803-1943

e-ISSN

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Volume of the periodical

70

Issue of the periodical within the volume

1

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

9

Pages from-to

43-51

UT code for WoS article

999

EID of the result in the Scopus database

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