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Vallettaite
A valid IMA mineral species - pending publication
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Formula:
Na2Mn2+(Mn2+Fe3+)(AsO4)3
Crystal System:
Monoclinic
Member of:
Name:
For the type locality
This page provides mineralogical data about Vallettaite.
Unique Identifiers
Mindat ID:
500654
Long-form identifier:
mindat:1:1:500654:6
Similar Names
| Falottaite | A valid IMA mineral species | MnC2O4 · 3H2O |
| Vilateite | A variety of Phosphosiderite | FePO4 · 2H2O |
IMA Classification of Vallettaite
Approved, Pending publication
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Vtt | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Chemistry of Vallettaite
Mindat Formula:
Na2Mn2+(Mn2+Fe3+)(AsO4)3
Element Weights:
Crystallography of Vallettaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 12.1741(5) Å, b = 13.0328(5) Å, c = 6.7861(3) Å
β = 113.451(5)°
β = 113.451(5)°
Ratio:
a:b:c = 0.934 : 1 : 0.521
Unit Cell V:
987.77 Ã
Âģ (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.448 Ã | (25) |
| 3.252 Ã | (66) |
| 2.974 Ã | (41) |
| 2.805 Ã | (100) |
| 2.662 Ã | (84) |
| 1.836 Ã | (24) |
| 1.680 Ã | (37) |
| 1.365 Ã | (25) |
Type Occurrence of Vallettaite
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museo delle Collezioni di Mineralogia, Gemmologia, Petrologia e Giacimentologia, Dipartimento di Scienze della Terra âA. Desioâ, Università di Milano, Via Botticelli 23, 20133 Milano, Italy, catalogue number MCMGPG-H2026-001
Relationship of Vallettaite to other Species
Member of:
Other Members of Alluaudite Supergroup:
| Alluaudite Group | A group of complex Na-metal-phosphates and -arsenates. | |
| Bobfergusonite Group | ||
| Johanngeorgenstadtite | Ni2+4.5(AsO4)3 | Mon. 2/m : B2/b |
| Leybovite-K | KCuNa(MgFe3+)(AsO4)3 | Mon. 2/m : B2/b |
| Manganobadalovite | NaNaMn(MgFe3+)(AsO4)3 | Mon. 2/m : B2/b |
| Manganohatertite | NaNaCa(MnFe3+)(AsO4)3 | Mon. 2/m : B2/b |
| Manitobaite Group | ||
| Wyllieite Group |
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 Vallettaite
mindat.org URL:
https://www.mindat.org/min-500654.html
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References for Vallettaite
Localities for Vallettaite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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.
Italy (TL) | |
| CÃĄmara |
