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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
Grosses Chalttal, Chalttal area, Mürtschenalp, Glarus Nord, Glarus, Switzerland