Where it forms, where it's found
- Geological setting
supergene phases related to the alteration of tetrahedrite-group minerals
- Type locality
- Hochmättli
- Mürtschenalp
- Glarus Nord
- Glarus
- Switzerland
47.0525°, 9.1731°
2recorded occurrences
Safety & handling
Physical
Optical
- Optical type
- Biaxial · 2V measured = > 65°
- Pleochroism
- Weak
- Dispersion
- weak
- UV response
- Does not fluoresce under both short- and long-wavelength UV radiation.
- Notes
Zanelliite reacts immediately with immersion index liquids with n > 1.74 and for this reason the refractive index could not be measured. On the basis of the Gladstone-Dale relationship, the mean refractive index should be 1.796
Crystallography
- Space group
- C2/c
- Cell parameters
- a = 39.395(7) Å · b = 5.5563(9) Å · c = 10.537(2) Å
- Cell angles
- β = 95.109(6) °
- Ratio a:b:c
- 1 : 0.141 : 0.267
- Z
- 4
- Type-locality form
star-like aggregates of oval-shaped, tabular crystals, flattened on (100), up to 0.05 mm in size
Chemical composition
Synonyms
- IMA2024-061
- Zanelliiet
In other languages
- German
- IMA 2024-061 · Zanelliit
Classification
Strunz
10th ed.7.BD
- 7SulfatesClass
- 7.BSulfates (selenates, etc.) with additional anions, without H2ODivision
- 7.BDWith only large cationsGroup
- 7.BDZanelliiteSpecies
Literature, links & citation
Citations
- 2025Biagioni, Cristian; Roth, Philippe; Reynes, Julien; Robyr, Martin; Meisser, Nicolas (2025) Zanelliite, PbCu9[AsO3.5(OH)0.5]2(AsO4)2(OH)9(H2O)3, a new mineral species from Grosses Chalttal, Switzerland. Mineralogical Magazine, 1-23 doi:10.1180/mgm.2025.10164DOI: 10.1180/mgm.2025.10164
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Zanelliite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/zanelliite-471494},
note = {Accessed 2026-05-11}
}