Radvaniceite, GeS2, a New Germanium Sulphide, from the Kateřina Mine, Radvanice near Trutnov, Czech Republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F22%3A00000026" target="_blank" >RIV/00025798:_____/22:00000026 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00023272:_____/22:10135630 RIV/00216224:14310/22:00125581

Výsledek na webu

<a href="https://doi.org/10.3390/min12020222" target="_blank" >https://doi.org/10.3390/min12020222</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/min12020222" target="_blank" >10.3390/min12020222</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Radvaniceite, GeS2, a New Germanium Sulphide, from the Kateřina Mine, Radvanice near Trutnov, Czech Republic

Popis výsledku v původním jazyce

The new mineral radvaniceite, GeS2, was found on the burning coal mine dump of the abandoned Kateřina coal mine at Radvanice, near Trutnov, northern Bohemia, Czech Republic. It occurs as aggregates  resembling  cotton  tufts  up  to  5  mm  in  size;  they  are  composed  of acicular  crystals up to fibres about 1–5 mikrometr thick and up to 3 mm in length. Individual fibres are distorted and partly resemble bent wires nucleated on rock fragments or on black, crumbly ash, in associa‐tion with minerals of solid solutions of Bi‐Sb and stangersite, herzenbergite, and greenockite. Radvaniceite was also observed as irregular grains in a range of 10–50 mikrometr in size, forming part of earlier multicomponent aggregates upon which the above‐described crystals grow. These aggre‐gates are formed, in addition to radvaniceite, by minerals of Bi‐Sb, Bi2S3‐Sb2S3 and Bi2S3‐Bi2Se3 solid solutions,  Bi3S2,  Bi‐sulpho/seleno/tellurides,  tellurium,  unnamed  PbGeS3,  Cd4GeS6,  GeAsS,  Sn5Sb3S7, stangersite, greenockite, cadmoindite, herzenbergite, teallite, and Sn‐ and/or Se‐bearing galena. Radvaniceite is formed under reducing conditions by direct crystallization from hot gasses (250–350 °C) containing Cl and F at a depth of 30–60 cm under the surface of a burning coal mine dump; the mine dump fire started spontaneously, and no anthropogenic material was deposited there.  Acicular  crystals up to fibres  of  radvaniceite  are elastic  to  flexible;  are  white  to  yellowish  grey in colour, with white streaks; are translucent in transmitted light; and have vitreous to ada‐mantine lustre. Cleavage and fracture were not observed. The calculated density is 3.05 and 2.99 g∙cm−3  for  the  empirical  and  ideal  formulae,  respectively.  Radvaniceite  is  transparent  under  the  microscope, with a very weak pleochroism (from colourless to pale greenish yellow), and has a refraction index > 1.8. Under reflected light, radvaniceite is light grey; bireflectance and pleochro‐ism were not observed due to abundant, white to grey, internal reflections. Anisotropy in crossed polars is distinct with grey rotation tints. Reflectance values of radvaniceite in air (Rmin–Rmax, procent) are: 15.4–18.8 at 470 nm, 16.1–20.4 at 546 nm, 16.4–20.8 at 589 nm, and 16.9–20.9 at 650 nm. The empir‐ical formula, based on electron‐microprobe analyses, is (Ge0.99Bi0.01)sigma1.00(S1.97Se0.03)sigma2.00. The ideal formula is GeS2, which requires Ge 53.10, S 46.90, total 100 wt. procent. Radvaniceite is monoclinic, Pc, a = 6.8831(12),  b =  22.501(3),  c  =  6.8081(11)  angstroem, beta =  120.365(9)°,  with  V  =  909.8(4)  angstroem3  and  Z  =  12. The  strongest reflections of the powder X‐ray diffraction pattern [d, angstroem (I) (hkl)] are: 5.7395 (100) (11‐1,110), 5.2067 (16) (021), 3.3650 (33) (111,11‐2), 2.8417 (33) (022), 2.8236 (16) (170,17‐1), 2.8134 (20) (080) and 2.6257 (19) (240,24‐2). According to X‐ray powder diffraction data and Raman spectros‐copy, radvaniceite is a natural analogue of synthetic monoclinic low‐temperature beta‐GeS2 with distorted GeS4 tetrahedra forming four corner‐sharing tetrahedral chains, which are connected by corner‐sharing  tetrahedra  in a  three‐dimensional structure.  We named  the mineral  after its  type  locality, Radvanice, one of the past centres of coal mining in the Czech limb of the Intra‐Sudetic Basin. This mineral and its name have been approved by the Commission on New Minerals, No‐menclature and Classification of the International Mineralogical Association (number 2021‐052).  

Název v anglickém jazyce

Radvaniceite, GeS2, a New Germanium Sulphide, from the Kateřina Mine, Radvanice near Trutnov, Czech Republic

Popis výsledku anglicky

The new mineral radvaniceite, GeS2, was found on the burning coal mine dump of the abandoned Kateřina coal mine at Radvanice, near Trutnov, northern Bohemia, Czech Republic. It occurs as aggregates  resembling  cotton  tufts  up  to  5  mm  in  size;  they  are  composed  of acicular  crystals up to fibres about 1–5 mikrometr thick and up to 3 mm in length. Individual fibres are distorted and partly resemble bent wires nucleated on rock fragments or on black, crumbly ash, in associa‐tion with minerals of solid solutions of Bi‐Sb and stangersite, herzenbergite, and greenockite. Radvaniceite was also observed as irregular grains in a range of 10–50 mikrometr in size, forming part of earlier multicomponent aggregates upon which the above‐described crystals grow. These aggre‐gates are formed, in addition to radvaniceite, by minerals of Bi‐Sb, Bi2S3‐Sb2S3 and Bi2S3‐Bi2Se3 solid solutions,  Bi3S2,  Bi‐sulpho/seleno/tellurides,  tellurium,  unnamed  PbGeS3,  Cd4GeS6,  GeAsS,  Sn5Sb3S7, stangersite, greenockite, cadmoindite, herzenbergite, teallite, and Sn‐ and/or Se‐bearing galena. Radvaniceite is formed under reducing conditions by direct crystallization from hot gasses (250–350 °C) containing Cl and F at a depth of 30–60 cm under the surface of a burning coal mine dump; the mine dump fire started spontaneously, and no anthropogenic material was deposited there.  Acicular  crystals up to fibres  of  radvaniceite  are elastic  to  flexible;  are  white  to  yellowish  grey in colour, with white streaks; are translucent in transmitted light; and have vitreous to ada‐mantine lustre. Cleavage and fracture were not observed. The calculated density is 3.05 and 2.99 g∙cm−3  for  the  empirical  and  ideal  formulae,  respectively.  Radvaniceite  is  transparent  under  the  microscope, with a very weak pleochroism (from colourless to pale greenish yellow), and has a refraction index > 1.8. Under reflected light, radvaniceite is light grey; bireflectance and pleochro‐ism were not observed due to abundant, white to grey, internal reflections. Anisotropy in crossed polars is distinct with grey rotation tints. Reflectance values of radvaniceite in air (Rmin–Rmax, procent) are: 15.4–18.8 at 470 nm, 16.1–20.4 at 546 nm, 16.4–20.8 at 589 nm, and 16.9–20.9 at 650 nm. The empir‐ical formula, based on electron‐microprobe analyses, is (Ge0.99Bi0.01)sigma1.00(S1.97Se0.03)sigma2.00. The ideal formula is GeS2, which requires Ge 53.10, S 46.90, total 100 wt. procent. Radvaniceite is monoclinic, Pc, a = 6.8831(12),  b =  22.501(3),  c  =  6.8081(11)  angstroem, beta =  120.365(9)°,  with  V  =  909.8(4)  angstroem3  and  Z  =  12. The  strongest reflections of the powder X‐ray diffraction pattern [d, angstroem (I) (hkl)] are: 5.7395 (100) (11‐1,110), 5.2067 (16) (021), 3.3650 (33) (111,11‐2), 2.8417 (33) (022), 2.8236 (16) (170,17‐1), 2.8134 (20) (080) and 2.6257 (19) (240,24‐2). According to X‐ray powder diffraction data and Raman spectros‐copy, radvaniceite is a natural analogue of synthetic monoclinic low‐temperature beta‐GeS2 with distorted GeS4 tetrahedra forming four corner‐sharing tetrahedral chains, which are connected by corner‐sharing  tetrahedra  in a  three‐dimensional structure.  We named  the mineral  after its  type  locality, Radvanice, one of the past centres of coal mining in the Czech limb of the Intra‐Sudetic Basin. This mineral and its name have been approved by the Commission on New Minerals, No‐menclature and Classification of the International Mineralogical Association (number 2021‐052).  

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

Minerals

ISSN

2075-163X

e-ISSN

—

Svazek periodika

12

Číslo periodika v rámci svazku

2 : 222

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

12

Strana od-do

nestránkováno

Kód UT WoS článku

000764199800001

EID výsledku v databázi Scopus

2-s2.0-85124135218