Zanelliite
A valid IMA mineral species - pending publication
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About Zanelliite
Remo Zanelli
Formula:
PbCu9[AsO3.5(OH)0.5]2(AsO4)2(OH)9(H2O)3
Colour:
turquoise-green
Lustre:
Vitreous
Hardness:
3½
Specific Gravity:
4.425 (Calculated)
Crystal System:
Monoclinic
Name:
Zanelliite honours the mineral collector, mathematics and geography teacher Dr. Remo Zanelli (b. 1977) for his contributions to the knowledge of the secondary minerals of the ore deposits of the Glarus Alps.
New structure type
Two different kinds of layers can be identified, i.e., a Cu-Pb-As heteropolyhedral layer, with composition [PbCu6As4O14(OH)6(H2O)], and a Cu layer, with formula[Cu3O(OH)4(H2O)2]. The crystal structure is composed of an alternating stacking of these two types of layers in a 1:1 ratio.
Two different kinds of layers can be identified, i.e., a Cu-Pb-As heteropolyhedral layer, with composition [PbCu6As4O14(OH)6(H2O)], and a Cu layer, with formula[Cu3O(OH)4(H2O)2]. The crystal structure is composed of an alternating stacking of these two types of layers in a 1:1 ratio.
Unique Identifiers
Mindat ID:
471494
Long-form identifier:
mindat:1:1:471494:7
Similar Names
| Zonolite | A synonym of Vermiculite |
IMA Classification of Zanelliite
Approved, Pending publication
IMA Formula:
Pb2+Cu2+9[As5+O3.5(OH)0.5]2(As5+O4)2(OH)9(H2O)3
Approval year:
2024
Classification of Zanelliite
7.BD.
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
D : With only large cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Znl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Zanelliite
Vitreous
Transparency:
Transparent
Colour:
Turquoise-green
Streak:
Pale green
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100}
{100}
Density:
4.425 g/cm3 (Calculated)
Comment:
Zanelliite reacts with the Clerici solution, sinking in diiodomethane; its measured density is higher than 3.32 g cm–3
Optical Data of Zanelliite
Type:
Biaxial
Dispersion:
weak
Pleochroism:
Weak
Comments:
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
Chemistry of Zanelliite
Mindat Formula:
PbCu9[AsO3.5(OH)0.5]2(AsO4)2(OH)9(H2O)3
Element Weights:
Crystallography of Zanelliite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 39.395(7) Å, b = 5.5563(9) Å, c = 10.537(2) Å
β = 95.109(6)°
β = 95.109(6)°
Ratio:
a:b:c = 7.09 : 1 : 1.896
Unit Cell V:
2,297.29 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 19.7 Å | (vs) |
| 4.86 Å | (s) |
| 4.48 Å | (m) |
| 4.28 Å | (m) |
| 3.777 Å | (m) |
| 2.964 Å | (s) |
| 2.708 Å | (s) |
| 2.569 Å | (m) |
Type Occurrence of Zanelliite
Co-Type Localities:
General Appearance of Type Material:
star-like aggregates of oval-shaped, tabular crystals, flattened on {100}, up to 0.05 mm in size
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Museum Cantonal des Sciences Naturelles (Naturéum), Département de Géologie, Université de Lausanne, Anthropole, Dorigny, 1015 Lausanne, Switzerland, catalogue number MGL 087285, and the Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (PI), Italy, catalogue number 20077
Geological Setting of Type Material:
supergene phases related to the alteration of tetrahedrite-group minerals
Associated Minerals at Type Locality:
Synonyms of Zanelliite
Other Language Names for Zanelliite
Dutch:Zanelliiet
German:Zanelliit
Related Minerals - Strunz-mindat Grouping
| 7.BD. | Hasanovite | KNa(MoO2)(SO4)2 |
| 7.BD. | Kennygayite | [Pb4O2(OH)2](SO4) |
| 7.BD. | Adanite | Pb2(Te4+O3)(SO4) |
| 7.BD. | Cadsulfohite | Cd2(SO4)(OH)2 |
| 7.BD. | Hyblerite | Pb4Bi2(SO4)2(CO3)O4 |
| 7.BD. | Evanichite | Pb6Cr3+(Cr6+O4)2(SO4)(OH)7FCl |
| 7.BD.05 | Sulphohalite | Na6(SO4)2FCl |
| 7.BD.10 | Galeite | Na15(SO4)5F4Cl |
| 7.BD.10 | Schairerite | Na21(SO4)7ClF6 |
| 7.BD.15 | Kogarkoite | Na3(SO4)F |
| 7.BD.20 | Aiolosite | Na4Bi(SO4)3Cl |
| 7.BD.20 | Caracolite | Na3Pb2(SO4)3Cl |
| 7.BD.20 | Cesanite | Na3Ca2(SO4)3(OH) |
| 7.BD.25 | Burkeite | Na6(CO3)(SO4)2 |
| 7.BD.30 | Hanksite | Na22K(SO4)9(CO3)2Cl |
| 7.BD.35 | Cannonite | Bi2(SO4)O(OH)2 |
| 7.BD.40 | Lanarkite | Pb2(SO4)O |
| 7.BD.45 | Grandreefite | Pb2(SO4)F2 |
| 7.BD.50 | Itoite | Pb3Ge4+(SO4)2O2(OH)2 |
| 7.BD.55 | Chiluite | Bi3Te6+Mo6+O10.5 |
| 7.BD.60 | Hectorfloresite | Na9(SO4)4(IO3) |
| 7.BD.65 | Pseudograndreefite | Pb6(SO4)F10 |
| 7.BD.70 | Sundiusite | Pb10(SO4)O8Cl2 |
Fluorescence of Zanelliite
Does not fluoresce under both short- and long-wavelength UV
radiation.
radiation.
Other Information
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 Zanelliite
mindat.org URL:
https://www.mindat.org/min-471494.html
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References for Zanelliite
Localities for Zanelliite
Showing 2 localities.
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The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Switzerland (TL) | |
| Biagioni et al. (2024) |
| Biagioni et al. (2025) |
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Grosses Chalttal, Chalttal area, Mürtschenalp, Glarus Nord, Glarus, Switzerland