Zvěstovite-(Zn)

Ag6(Ag4Zn2)As4S13
IMA status
  • Approved
IMA symbol
Zvĕ-Zn
IMA approved
2020
Also known as
  • IMA2020-061
  • Unnamed (As-analogue of Rozhdestvenskayaite-(Zn))
  • Zvěstoviet-(Zn)

Where it forms, where it's found

Type locality
Zvěstov deposit
  1. Zvěstov
  2. Benešov District
  3. Central Bohemian Region
  4. Czech Republic

49.6442°, 14.7978°

5recorded occurrences
Source · OpenStreetMap

Safety & handling

Physical

Hardness
123456789103.5 – 4/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Transparency
Opaque
Colour
Grey
Density
5.16 g/cm³

Optical

Pleochroism
Non-pleochroic
Optical colour
Grey with a greenish tint.
Bireflectance
None
Internal reflections
Ubiquitous, deep red
Tropism
Isotropic
Reflectance R%
(28.5) 470, (26.9) 546, (25.5) 589, (23.8) 650
Reflected-light panel
R̄ 26.2 %isotropic · single curve
Specimen sRGB 181, 131, 75
White reference100 % reflector under same lamp
Bireflectance
None
Reflected colour
Grey with a greenish tint.
Internal reflections
Ubiquitous, deep red

Crystallography

Crystal system
Isometric
Cell parameters
a = 10.850(2) Å
Z
2
Type-locality form

Rare relic anhedral grains rimmed by acanthite, up to 100 μm in size.

Comment

Spacegroup I4-3m

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
47AgSilverSilver10107.8681078.680
56.01%
16SSulfurSulfur1332.060416.780
21.64%
33AsArsenicArsenic474.922299.688
15.56%
30ZnZincZinc265.380130.760
6.79%
Total1925.908100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • IMA2020-061
  • Unnamed (As-analogue of Rozhdestvenskayaite-(Zn))
  • Zvěstoviet-(Zn)

In other languages

German
IMA 2020-061 · Zvĕstovit-(Zn)
Italian
Zvěstovite- · Zvěstovite-(Zn)

Classification

Strunz
10th ed.

2.GB

  • 2Sulfides and SulfosaltsClass
  • 2.GSulfarsenites, sulfantimonites, sulfbismuthitesDivision
  • 2.GBNeso-sulfarsenites, etc. with additional SGroup
  • 2.GBZvěstovite-(Zn)Species

Group, growth & confusion

In the same group
1 members

Literature, links & citation

Citations
  1. 1988Samusikov, V.P., Zayakina, N.V., Leskova, N.V. (1988): Dependence of unit-cell dimension of tetrahedrite-tennantite ores on silver content. Doklady Akademii Nauk SSSR 299, 468-471 (in Russian).
  2. 2020Biagioni, Cristian, George, Luke L., Cook, Nigel J., Makovicky, Emil, Moëlo, Yves, Pasero, Marco, Sejkora, Jiří, Stanley, Chris J., Welch, Mark D., Bosi, Ferdinando (2020) The tetrahedrite group: Nomenclature and classification. American Mineralogist, 105 (1) 109-122 doi:10.2138/am-2020-7128DOI: 10.2138/am-2020-7128
  3. 2020Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2020) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 58. European Journal of Mineralogy, 32 (6) 645-651 doi:10.5194/ejm-32-645-2020 DOI: 10.5194/ejm-32-645-2020
  4. 2021Sejkora, Jiří, Biagioni, Cristian, Vrtiška, Luboš, Moëlo, Yves (2021) Zvěstovite-(Zn), Ag6(Ag4Zn2)As4S13, a new tetrahedrite-group mineral from Zvěstov, Czech Republic. Mineralogical Magazine, 85 (5) 716-724 doi:10.1180/mgm.2021.57DOI: 10.1180/mgm.2021.57
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Zvěstovite-(Zn) — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/zvestovite-zn-55246},
  note      = {Accessed 2026-05-11}
}