Zvěstovite-(Zn), Ag6(Ag4Zn2) As4S13, a new tetrahedrite-group mineral from Zvěstov, Czech Republic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F21%3A10135286" target="_blank" >RIV/00023272:_____/21:10135286 - isvavai.cz</a>

Result on the web

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/zvestovitezn-ag6ag4zn2as4s13-a-new-tetrahedritegroup-mineral-from-zvestov-czech-republic/F2E446DC9EAC3AA5D59267D2FD230E5E" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/zvestovitezn-ag6ag4zn2as4s13-a-new-tetrahedritegroup-mineral-from-zvestov-czech-republic/F2E446DC9EAC3AA5D59267D2FD230E5E</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2021.57" target="_blank" >10.1180/mgm.2021.57</a>

Result language

angličtina

Original language name

Zvěstovite-(Zn), Ag6(Ag4Zn2) As4S13, a new tetrahedrite-group mineral from Zvěstov, Czech Republic

Original language description

The new mineral zvěstovite-(Zn) was found in quartz-baryte gangue at the mine dump of the abandoned small deposit of Zvěstov, central Bohemia, Czech Republic. Zvěstovite-(Zn) is associated with tennantite-(Zn), tetrahedrite-(Zn), argentotennantite-(Zn), acanthite, and supergene azurite and malachite. The new mineral occurs as rare relic anhedral grains rimmed by acanthite, up to 100 μm in size. Zvěstovite-(Zn) is grey, Mohs hardness is ca. 31/2 - 4, in agreement with other members of the tetrahedrite group; the calculated density is 5.16 g.cm-3. In reflected light, zvěstovite-(Zn) is grey with a greenish tint, without bireflectance, pleochroism and anisotropy. Deep red internal reflections are ubiquitous. Reflectance values of zvěstovite-(Zn) in air (R %) are: 28.5 at 470 nm, 26.9 at 546 nm, 25.5 at 589 nm, and 23.8 at 650 nm. The empirical formula for zvěstovite-(Zn), based on electron-microprobe analyses (n = 4), is Ag6.27[(Ag3.90Cu0.38)Σ4.28(Zn1.60Fe0.09Cd0.03)Σ1.72]Σ6.00(As2.26Sb1.48)Σ3.74S12.50. The ideal formula is Ag6(Ag4Zn2)As4S13, which requires (in wt%) Ag 56.01, Zn 6.79, As 15.56 and S 21.64, total 100.00. Zvěstovite-(Zn) is cubic, I-43m, with unit-cell parameter a = 10.850(2) Å, V = 1277.3(8) Å3, Z = 2. The strongest reflections of the calculated powder X-ray diffraction pattern [d, Å (I)(hkl)] are: 3.1321(100) (222), 2.7125(21) (400), 1.9809(11) (521), 1.9180(31) (440), 1.6357(15) (622). According to the single-crystal X-ray diffraction data (Robs = 0.051), the crystal structure of zvěstovite-(Zn) agrees with the general features of the members of the tetrahedrite group. Zvěstovite-(Zn) is named after its type locality, Zvěstov; the suffix indicates the dominant divalent C-constituent, according to the approved nomenclature of the tetrahedrite group. It is the As-isotype of rozhdestvenskayaite-(Zn).

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

2021

Confidentiality

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

Name of the periodical

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

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Volume of the periodical

85

Issue of the periodical within the volume

5

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

716-724

UT code for WoS article

000723015700008

EID of the result in the Scopus database

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