Lazerckerite (original) (raw)

A valid IMA mineral species

Formula:

Ag3.75Pb4.50(Sb7.75Bi4)S24

Specific Gravity:

5.920 (Calculated)

Crystal System:

Monoclinic

Name:

The mineral is named after Lazarus Ercker (1528 Annaberg-Buchholz, Germany – 1594 Prague, Czechia), the supreme Royal Bergmeister of the Kingdom of Bohemia (Minister of Mining) and the Master of Prague Mint, a renowned metallurgist, chemist, and mining specialist and the author of the Books on Assaying (original title Beschreibung Allerfürnemisten Mineralischen Ertzt und Berckwercksarten). This work – published in 1574 – was reissued 15 times, translated into four languages, and until the end of the 18th century was used as a principal textbook by all mining universities and Bergakademie in Europe.

Chemically similar to clino-oscarkempffite, izoklakeite, and staročeskéite. Co-described with also chemically (and stoichiometrically) similar holubite.

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+) ↔ 2 Pb2+ substitution) ≈ 90 %–95 %, and approximately one-third of atom percentage of antimony is replaced by bismuth (Bi(Bi+Sb) ≈ 0.30–0.38).

Unique IdentifiersHide

This section is currently hidden. Click the show button to view.

Long-form identifier:

mindat:1:1:470683:6

9be3726c-21e8-4e0f-86a4-0ed4d48d4000

IMA Classification of LazerckeriteHide

This section is currently hidden. Click the show button to view.

IMA Formula:

Ag3.75Pb4.50(Sb7.75Bi4)S24

Approval history:

IMA No. 2022-113

Type description reference:

Pažout, R., Dušek, M., Sejkora, J., Plášil, J., Ilinca, G., Dolnı́ček, Z. (2024) 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. European Journal of Mineralogy, 36 (4). 641-656 doi:10.5194/ejm-36-641-2024

Classification of LazerckeriteHide

This section is currently hidden. Click the show button to view.

2.JB.

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
B : Galena derivatives, with Pb

Mineral SymbolsHide

This section is currently hidden. Click the show button to view.

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of LazerckeriteHide

This section is currently hidden. Click the show button to view.

Density:

5.920 g/cm3 (Calculated)

Optical Data of LazerckeriteHide

This section is currently hidden. Click the show button to view.

Anisotropism:

weak to moderate, with grey to bluish-grey rotation tints.

Bireflectance:

weak grey tints

Reflectivity:

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 39.6%.
R1 shown in black, R2 shown in red

Colour in reflected light:

greyish white

Internal Reflections:

none observed

Chemistry of LazerckeriteHide

This section is currently hidden. Click the show button to view.

Mindat Formula:

Ag3.75Pb4.50(Sb7.75Bi4)S24

Crystallography of LazerckeriteHide

This section is currently hidden. Click the show button to view.

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 13.2083(9) Å, b = 19.4595(8) Å, c = 8.405(1) Å
β = 90.032(7)°

Ratio:

a:b:c = 0.679 : 1 : 0.432

Unit Cell V:

2,160.31 ų (Calculated from Unit Cell)

Twinning:

Twinned on (001).

Comment:

Pseudo-orthorhombic

X-Ray Powder DiffractionHide

This section is currently hidden. Click the show button to view.

Powder Diffraction Data:

Type Occurrence of LazerckeriteHide

This section is currently hidden. Click the show button to view.

General Appearance of Type Material:

replacement rims of earlier Ag–Pb–Bi–Sb minerals and grain aggregates, growing together in aggregates up to 0.6×0.3 mm.

Place of Conservation of Type Material:

collections of the Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 19300 Prague 9, Czech Republic, catalogue number P1P 11/2022

Geological Setting of Type Material:

origin of the mineral is related to the later Bi mineralization, and we assume the mineral is a replacement product of earlier, Bi-richer lillianite homologues and galena that crystallized from originally low-temperature (ca. 100–250 °C) hydrothermal fluids in the tectonically opened fractures in yet earlier hydrothermal Fe–Cu–Zn–Sn–As base sulfide ore vein fillings

Associated Minerals at Type Locality:

Synonyms of LazerckeriteHide

This section is currently hidden. Click the show button to view.

Relationship of Lazerckerite to other SpeciesHide

This section is currently hidden. Click the show button to view.

Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

This section is currently hidden. Click the show button to view.

Other InformationHide

This section is currently hidden. Click the show button to view.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for LazerckeriteHide

This section is currently hidden. Click the show button to view.

References for LazerckeriteHide

This section is currently hidden. Click the show button to view.

Reference List:

Pažout, R., Dušek, M., Sejkora, J., Plášil, J., Ilinca, G., Dolnı́ček, Z. (2024) 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. European Journal of Mineralogy, 36 (4). 641-656 doi:10.5194/ejm-36-641-2024

Localities for LazerckeriteHide

This section is currently hidden. Click the show button to view.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

This section is currently hidden. Click the show button to view.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.