Pertoldite, trigonal GeO2, the germanium analogue of α-quartz: a new mineral from Radvanice, Czech Republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F22%3A00000087" target="_blank" >RIV/00025798:_____/22:00000087 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.jgeosci.org/content/jgeosci.355_Zacek.pdf" target="_blank" >http://www.jgeosci.org/content/jgeosci.355_Zacek.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3190/jgeosci.355" target="_blank" >10.3190/jgeosci.355</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Pertoldite, trigonal GeO2, the germanium analogue of α-quartz: a new mineral from Radvanice, Czech Republic

Popis výsledku v původním jazyce

The new mineral pertoldite was found in a burning waste dump of abandoned Kateřina colliery at Radvanice near Trutnov, Hradec Králové Department, Czech Republic. The dump fire started spontaneously before 1980 and no anthropogenic material was deposited there. The determination of pertoldite as a natural analog of synthetic trigonal alfa-GeO2 is based on its chemical composition, X-ray powder diffraction data, and Raman spectroscopy. Pertoldite occurs as white to brownish aggregates resembling cotton tufts, up to 1 mm in size, composed of acicular crystals up to ~1 mikrometr thick and up to 1 mm in length. Individual crystals are distorted, resembling textile fibres. Pertoldite was formed by direct crystallization from hot (400–500 °C) gasses containing Cl and F as transporting agents at a depth of 40–60 cm under the surface of a burning coal mine dump. It nucleated as a thin, delicate crust on a chip of siltstone together with multi-component aggregates of galena, stibnite, bismuthian antimony, greenockite, and bismuth. The ideal formula of pertoldite, GeO2, requires 100 wt. procent GeO2. Germanium is partially substituted by silica (2.33–5.67 wt. procent SiO2), the extent of Ge1Si–1 substitution is limited to 0.03–0.09 apfu Si, and the empirical formula ranges between (Ge0.91-0.97Si0.03-0.09)sigma1.00O2. Pertoldite is trigonal, P3121 or P3221, a = 4.980(5) angstroem, c = 5.644(4) angstroem, with V = 121.2(2) angstroem3 and Z = 3. The strongest reflections of the powder X-ray diffraction pattern [d (angstroem)/I (hkl)] are: 4.315/44(100), 3.425/100(101,011), 2.490/31(110), 2.360/41(012,102), 1.867/31(112), 1.4179/31(023,203), 1.4124/37 (122,212). The crystal structure of pertoldite is based on corner-sharing [GeO4] tetrahedra forming a three-dimensional network similar to that of alfa-quartz. Pertoldite is named after Zdeněk Pertold (1933–2020), professor of the economic geology at the Faculty of Sciences of the Charles University in Prague. The mineral and its name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (number 2021-074) and the holotype specimen is deposited in the collections in the Department of Mineralogy and Petrology, National Museum in Prague, under the catalogue number P1P 31/2021.

Název v anglickém jazyce

Pertoldite, trigonal GeO2, the germanium analogue of α-quartz: a new mineral from Radvanice, Czech Republic

Popis výsledku anglicky

The new mineral pertoldite was found in a burning waste dump of abandoned Kateřina colliery at Radvanice near Trutnov, Hradec Králové Department, Czech Republic. The dump fire started spontaneously before 1980 and no anthropogenic material was deposited there. The determination of pertoldite as a natural analog of synthetic trigonal alfa-GeO2 is based on its chemical composition, X-ray powder diffraction data, and Raman spectroscopy. Pertoldite occurs as white to brownish aggregates resembling cotton tufts, up to 1 mm in size, composed of acicular crystals up to ~1 mikrometr thick and up to 1 mm in length. Individual crystals are distorted, resembling textile fibres. Pertoldite was formed by direct crystallization from hot (400–500 °C) gasses containing Cl and F as transporting agents at a depth of 40–60 cm under the surface of a burning coal mine dump. It nucleated as a thin, delicate crust on a chip of siltstone together with multi-component aggregates of galena, stibnite, bismuthian antimony, greenockite, and bismuth. The ideal formula of pertoldite, GeO2, requires 100 wt. procent GeO2. Germanium is partially substituted by silica (2.33–5.67 wt. procent SiO2), the extent of Ge1Si–1 substitution is limited to 0.03–0.09 apfu Si, and the empirical formula ranges between (Ge0.91-0.97Si0.03-0.09)sigma1.00O2. Pertoldite is trigonal, P3121 or P3221, a = 4.980(5) angstroem, c = 5.644(4) angstroem, with V = 121.2(2) angstroem3 and Z = 3. The strongest reflections of the powder X-ray diffraction pattern [d (angstroem)/I (hkl)] are: 4.315/44(100), 3.425/100(101,011), 2.490/31(110), 2.360/41(012,102), 1.867/31(112), 1.4179/31(023,203), 1.4124/37 (122,212). The crystal structure of pertoldite is based on corner-sharing [GeO4] tetrahedra forming a three-dimensional network similar to that of alfa-quartz. Pertoldite is named after Zdeněk Pertold (1933–2020), professor of the economic geology at the Faculty of Sciences of the Charles University in Prague. The mineral and its name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (number 2021-074) and the holotype specimen is deposited in the collections in the Department of Mineralogy and Petrology, National Museum in Prague, under the catalogue number P1P 31/2021.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

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

67

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

9

Strana od-do

229-237

Kód UT WoS článku

000891320300002

EID výsledku v databázi Scopus

2-s2.0-85142766182