Lazerckerite, Ag3.75Pb4.5(Sb7.75Bi4)S24, from Kutná Hora, Czech Republic: a new Sb-Bi member of the andorite branch of the lillianite homologous series

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F24%3A10136683" target="_blank" >RIV/00023272:_____/24:10136683 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/24:00597759 RIV/60461373:22810/24:43930684

Result on the web

<a href="https://ejm.copernicus.org/articles/36/641/2024/" target="_blank" >https://ejm.copernicus.org/articles/36/641/2024/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/ejm-36-641-2024" target="_blank" >10.5194/ejm-36-641-2024</a>

Result language

angličtina

Original language name

Lazerckerite, Ag3.75Pb4.5(Sb7.75Bi4)S24, from Kutná Hora, Czech Republic: a new Sb-Bi member of the andorite branch of the lillianite homologous series

Original language description

Lazerckerite, ideally Ag3.75Pb4.5(Sb7.75Bi4)S24, is a new mineral species found in medieval mine dumps of the historic Ag-Pb-Zn Kutná Hora ore district, Czech Republic. The mineral is associated with other Sb-Bi lillianite homologues (terrywallaceite, gustavite, holubite) and Ag,Bi-bearing galena, most frequently as grain aggregates and replacement rims of earlier Ag-Pb-Bi minerals, growing together in aggregates of up to 0.6x0.3 mm. Lazerckerite is opaque, is steel grey in colour, and has a metallic lustre; the calculated density is 5.920 g cmMINUS SIGN 3. In reflected light lazerckerite is greyish white, and bireflectance and pleochroism are weak with grey tints. Anisotropy is weak to moderate with grey to bluish-grey rotation tints. Internal reflections are not observed. Electron microprobe analyses yielded the empirical formula, based on 44 apfu, (Ag3.61Cu0.04)Σ3.65(Pb4.55Fe0.01Cd0.01)Σ4.57(Sb7.87Bi3.75)Σ11.62(S24.15Se0.01)Σ24.16. Its unit cell parameters are a=13.2083(9), b=19.4595(8), c=8.4048(13), β=90.032(7)o, V=2160.3(4) Å3, space group P2, and Z=2. The structure of lazerckerite contains two Pb sites (Pb1 and Pb2) in bicapped trigonal prismatic coordination, 8 independent octahedral sites, and 13 distinct sulfur positions. Four of the octahedral sites are mixed (Sb,Bi) and (Bi,Sb) sites, one is a mixed (Ag,Bi) site, and one is a mixed (Sb,Pb) site. The new mineral belongs to the andorite branch of the lillianite homologous series with N=4 and is a new addition to the group of Sb-Bi mixed members of the series. Lazerckerite is defined as a lillianite homologue with the three following requirements: N=4, L (Ag (Bi3+, Sb3+) LEFT RIGHT ARROW  2 Pb2+ substitution) ALMOST EQUAL TO 90 %-95 %, and approximately one-third of atom percentage of antimony is replaced by bismuth (Bi(Bi+Sb) ALMOST EQUAL TO 0.30-0.38). The new mineral has been named after Lazarus Ercker, the supreme Royal Bergmeister of the Kingdom of Bohemia and the Master of Prague Mint.

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

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

European Journal of Mineralogy

ISSN

0935-1221

e-ISSN

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Volume of the periodical

36

Issue of the periodical within the volume

4

Country of publishing house

DE - GERMANY

Number of pages

16

Pages from-to

641-656

UT code for WoS article

001300247800001

EID of the result in the Scopus database

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