Theuerdankite
A valid IMA mineral species
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About Theuerdankite
Formula:
Ag3AsO4
Colour:
Dark violet, changing to reddish and black when exposed to the air and light.
Hardness:
2
Specific Gravity:
6.622 (Calculated)
Crystal System:
Isometric
Name:
It is named after the type locality, the Alter Theuerdank Mine.
New structure type. Known as a synthetic compound.
One of the most chemically simple Ag minerals (silver orthoarsenate(V)). Compare rudabányaite (the first natural silver arsenate) and tillmannsite.
One of the most chemically simple Ag minerals (silver orthoarsenate(V)). Compare rudabányaite (the first natural silver arsenate) and tillmannsite.
Unique Identifiers
Mindat ID:
470781
Long-form identifier:
mindat:1:1:470781:9
IMA Classification of Theuerdankite
Approved
IMA Formula:
Ag1+3(As5+O4)
Approval year:
2023
Approval history:
IMA no. 2023-009
Type description reference:
Plášil, Jakub, Sejkora, Jiří, Dolníček, Zdeněk, Petříček, Václav, Désor, Joy, Majzlan, Juraj, Gross, Manfred, Möhn, Gerhard, Schürmann, Christian (2024) Theuerdankite, Ag3AsO4, a new mineral from the Alter Theuerdank Mine, St. Andreasberg, Germany. Mineralogical Magazine, 88 (5). 557-564 doi:10.1180/mgm.2024.44
Classification of Theuerdankite
8.BO.
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
O : With only large cations, (OH, etc.):RO4 about 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
O : With only large cations, (OH, etc.):RO4 about 1:1
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 |
|---|---|---|
| Td | 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 Theuerdankite
Colour:
Dark violet, changing to reddish and black when exposed to the air and light.
Comment:
Changing to reddish and black when exposed to the air. It darkens when exposed to light.
Streak:
grey to violet grey streak; when readily fresh, its streak is brownish-red
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Conchoidal
Density:
6.622 g/cm3 (Calculated)
Chemistry of Theuerdankite
Mindat Formula:
Ag3AsO4
Element Weights:
Elements listed:
Chemical Analysis
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | Ag3.00As1.00O4 |
Sample references:
Crystallography of Theuerdankite
Crystal System:
Isometric
Class (H-M):
43m - Hextetrahedral
Space Group:
P43n
Cell Parameters:
a = 6.144(2) Å
Unit Cell V:
231.93 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.077 Å | (14) |
| 2.735 Å | (100) |
| 2.502 Å | (51) |
| 1.778 Å | (8) |
| 1.707 Å | (18) |
| 1.640 Å | (30) |
| 1.537 Å | (6) |
| 1.341 Å | (10) |
Reference:
Plášil, Jakub, Sejkora, Jiří, Dolníček, Zdeněk, Petříček, Václav, Désor, Joy, Majzlan, Juraj, Gross, Manfred, Möhn, Gerhard, Schürmann, Christian (2024) Theuerdankite, Ag3AsO4, a new mineral from the Alter Theuerdank Mine, St. Andreasberg, Germany. Mineralogical Magazine, 88 (5). 557-564 doi:10.1180/mgm.2024.44
Type Occurrence of Theuerdankite
General Appearance of Type Material:
aggregates of anhedral grains up to 3 mm in size, growing in cavities of strongly supergene-weathered material
Place of Conservation of Type Material:
collections of the Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00 Prague 9, Czech Republic, catalogue number P1P 59/2022
Associated Minerals at Type Locality:
Reference:
Plášil, Jakub, Sejkora, Jiří, Dolníček, Zdeněk, Petříček, Václav, Désor, Joy, Majzlan, Juraj, Gross, Manfred, Möhn, Gerhard, Schürmann, Christian (2024) Theuerdankite, Ag3AsO4, a new mineral from the Alter Theuerdank Mine, St. Andreasberg, Germany. Mineralogical Magazine, 88 (5). 557-564 doi:10.1180/mgm.2024.44
Synonyms of Theuerdankite
Other Language Names for Theuerdankite
Dutch:Theuerdankiet
German:Theuerdankit
Common Associates
Associations Based on Photo Data:
| 1 photo of Theuerdankite associated with Native Silver | Ag |
| 1 photo of Theuerdankite associated with Chlorargyrite | AgCl |
| 1 photo of Theuerdankite associated with Calcite | CaCO3 |
Related Minerals - Strunz-mindat Grouping
| 8.BO. | Ariegilatite | BaCa12(SiO4)4(PO4)2F2O |
| 8.BO. | Aravaite | Ba2Ca18(SiO4)6(PO4)3(CO3)F3O |
| 8.BO.05 | Nacaphite | Na2Ca(PO4)F |
| 8.BO.10 | Petitjeanite | Bi3(PO4)2O(OH) |
| 8.BO.10 | Schumacherite | Bi3(VO4)2O(OH) |
| 8.BO.10 | Preisingerite | Bi3(AsO4)2O(OH) |
| 8.BO.15 | Hechtsbergite | Bi2(VO4)O(OH) |
| 8.BO.15 | Smrkovecite | Bi2(PO4)O(OH) |
| 8.BO.15 | Atelestite | Bi2(AsO4)O(OH) |
| 8.BO.20 | Sahlinite | Pb14(AsO4)2O9Cl4 |
| 8.BO.20 | Kombatite | Pb14(VO4)2O9Cl4 |
| 8.BO.25 | Heneuite | CaMg5(CO3)(PO4)3(OH) |
| 8.BO.30 | Nefedovite | Na5Ca4(PO4)4F |
| 8.BO.35 | Kuznetsovite | [Hg2]2+Hg2+[AsO4]Cl |
| 8.BO.40 | Artsmithite | [Hg2]2+2Al(PO4)1.74(OH)1.78 |
| 8.BO.45 | Schlegelite | Bi7(AsO4)3(MoO4)2O4 |
| 8.BO.50 | Hereroite | [Pb32(O,◻)21](AsO4)2[(Si,As,V,Mo)O4]2Cl10 |
| 8.BO.50 | Erikjonssonite | (Pb32O21)[(V,Si,Mo,As)O4]4Cl9 |
| 8.BO.55 | Rudabányaite | (Ag2Hg2)(AsO4)Cl |
| 8.BO.60 | Segerstromite | Ca3(As5+O4)2[As3+(OH)3]2 |
| 8.BO.65 | Wiklundite | Pb2(Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6 |
Fluorescence of Theuerdankite
non-fluorescent in SW and LW ultraviolet light
Other Information
Special Storage/
Display Requirements:
Display Requirements:
color changing to reddish and black when exposed to the air and light
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 Theuerdankite
mindat.org URL:
https://www.mindat.org/min-470781.html
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Please feel free to link to this page.
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External Links:
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References for Theuerdankite
Reference List:
Weil, Matthias (2003) Investigations in the Systems Ag-Hg-X-O (X = AsV, SeIV, SeVI): Hydrothermal Single Crystal Growth of Ag3AsO4, AgHgI 2AsO4, AgHgIIAsO4, Ag2SeO4 and the Crystal Structure of Ag2HgII(SeO3)2. Zeitschrift für Naturforschung B, 58. 1091-1096 doi:10.1515/znb-2003-1110
Bosi, Ferdinando; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. (2023) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 73. European Journal of Mineralogy, 35 (3). 397-402 doi:10.5194/ejm-35-397-2023
Plášil, Jakub, Sejkora, Jiří, Dolníček, Zdeněk, Petříček, Václav, Désor, Joy, Majzlan, Juraj, Gross, Manfred, Möhn, Gerhard, Schürmann, Christian (2024) Theuerdankite, Ag3AsO4, a new mineral from the Alter Theuerdank Mine, St. Andreasberg, Germany. Mineralogical Magazine, 88 (5). 557-564 doi:10.1180/mgm.2024.44
Localities for Theuerdankite
Showing 1 localities.
symbol to view information about a locality.
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.
Germany (TL) | |
| Bosi et al. (2023) |
Quick NavTopAbout TheuerdankiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Chemistry Chemical AnalysisCrystallography X-Ray Powder DiffractionType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Alter Theuerdank Mine, Beerberg, St Andreasberg, Braunlage, Goslar District, Lower Saxony, Germany