Wiklundite
A valid IMA mineral species
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About Wiklundite
Formula:
Pb2(Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6
Colour:
Brownish-red, reddish-brown to dark brown
Lustre:
Resinous, Sub-Metallic
Specific Gravity:
4.072 (Calculated)
Crystal System:
Trigonal
Name:
Named after Markus Wiklund, born 1969, and Stefan Wiklund, born 1972, who jointly found the mineral; they are well-known Swedish mineral collectors.
New structure type. Chemically somewhat similar to hereroite. The mineral is associated, i.a., with a disordered wiklundite-like species.
The structure has 5 polyhedral layers, comprising:
- Mn2+-bearing octahedra, edge-sharing to form trimers and joined together by SiO4 tetrahedra
- Fe3+(H2O)6 octahedra + AsO3 triangular pyramids
- corner-sharing silicate and Mn2+O4 tetrahedra
- Mn2+Cl6 octahedra and Pb2+(OH)3Cl6 polyhedra
The structure has 5 polyhedral layers, comprising:
- Mn2+-bearing octahedra, edge-sharing to form trimers and joined together by SiO4 tetrahedra
- Fe3+(H2O)6 octahedra + AsO3 triangular pyramids
- corner-sharing silicate and Mn2+O4 tetrahedra
- Mn2+Cl6 octahedra and Pb2+(OH)3Cl6 polyhedra
Unique Identifiers
Mindat ID:
46820
Long-form identifier:
mindat:1:1:46820:0
GUID
(UUID V4):
(UUID V4):
f1cd6df4-5358-4520-a080-d09c0d175fe8
IMA Classification of Wiklundite
Approved
Approval year:
2015
First published:
2017
Type description reference:
Cooper, Mark A., Hawthorne, Frank C., Langhof, Jörgen, HÄlenius, Ulf, Holtstam, Dan (2017) Wiklundite, ideally Pb2[4](Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6, a new mineral from LÄngban, Filipstad, VÀrmland, Sweden: Description and crystal structure. Mineralogical Magazine, 81 (4) 841-855 doi:10.1180/minmag.2016.080.136
Classification of Wiklundite
8.BO.65
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 IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Wik | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Wiklundite
Resinous, Sub-Metallic
Comment:
"almost somewhat bronzy"
Colour:
Brownish-red, reddish-brown to dark brown
Streak:
pale yellowish brown
Tenacity:
Brittle
Cleavage:
Perfect
on {001}
on {001}
Parting:
not observed
Fracture:
Irregular/Uneven
Density:
4.072 g/cm3 (Calculated)
Optical Data of Wiklundite
Type:
Uniaxial (-)
Optical Extinction:
incomplete; distorted interference figures makes complete determination of the optical properties impossible
Pleochroism:
Non-pleochroic
Comments:
Orange-red in transmitted light
Chemistry of Wiklundite
Mindat Formula:
Pb2(Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6
Crystallography of Wiklundite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3c
Cell Parameters:
a = 8.257(2) Å, c = 126.59(4) Å
Ratio:
a:c = 1 : 15.331
Unit Cell V:
7474 Ă
Âł
Z:
6
Twinning:
not observed
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.128 Ă | (83) |
| 4.052 Ă | (58) |
| 3.251 Ă | (45) |
| 3.098 Ă | (81) |
| 2.882 Ă | (100) |
| 2.805 Ă | (90) |
| 2.384 Ă | (70) |
| 2.320 Ă | (56) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47e : [Vanadates, chromates, manganates] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Wiklundite
General Appearance of Type Material:
sheaf-like aggregates, up to 1 mm long, comprising thin and slightly bent lath-shaped crystals
Place of Conservation of Type Material:
Type material is deposited in the collections of the Department of Geosciences, Swedish Museum of Natural History,Box 50007, SE-10405 Stockholm, Sweden, collection number NRM#20040085.
Geological Setting of Type Material:
Dolomite-rich skarn
Associated Minerals at Type Locality:
Reference:
Cooper, M.A., Hawthorne, F.C., Langhof, J., HĂ„lenius, U., Holtstam, D. (2017): Wiklundite, ideally Pb2[4](Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6, a new mineral from LĂ„ngban, Filipstad, VĂ€rmland, Sweden: Description and crystal structure. Mineralogical Magazine 81: 841-855.
Synonyms of Wiklundite
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. | Theuerdankite | Ag3AsO4 |
| 8.BO.05 | Nacaphite | Na2Ca(PO4)F |
| 8.BO.10 | Preisingerite | Bi3(AsO4)2O(OH) |
| 8.BO.10 | Petitjeanite | Bi3(PO4)2O(OH) |
| 8.BO.10 | Schumacherite | Bi3(VO4)2O(OH) |
| 8.BO.15 | Atelestite | Bi2(AsO4)O(OH) |
| 8.BO.15 | Hechtsbergite | Bi2(VO4)O(OH) |
| 8.BO.15 | Smrkovecite | Bi2(PO4)O(OH) |
| 8.BO.20 | Kombatite | Pb14(VO4)2O9Cl4 |
| 8.BO.20 | Sahlinite | Pb14(AsO4)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,â»)21](AsO4)2[(Si,As,V,Mo]O4)2Cl10 |
| 8.BO.50 | Erikjonssonite | (Pb32O21)[(V,Si,Mo,As)O4]4Cl9 |
| 8.BO.55 | RudabĂĄnyaite | (Ag2Hg2)(AsO4)Cl |
| 8.BO.60 | Segerstromite | Ca3(As5+O4)2[As3+(OH)3]2 |
Fluorescence of Wiklundite
non-fluorescent
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 Wiklundite
mindat.org URL:
https://www.mindat.org/min-46820.html
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Wiklundite
Reference List:
HĂ„lenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 27. Mineralogical Magazine, 79 (5) 1223-1230 doi:10.1180/minmag.2015.079.5.16
Cooper, Mark A., Hawthorne, Frank C., Langhof, Jörgen, HÄlenius, Ulf, Holtstam, Dan (2017) Wiklundite, ideally Pb2[4](Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6, a new mineral from LÄngban, Filipstad, VÀrmland, Sweden: Description and crystal structure. Mineralogical Magazine, 81 (4) 841-855 doi:10.1180/minmag.2016.080.136
Localities for Wiklundite
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.
Sweden (TL) | |
| Mineralogical Magazine +2 other references |
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LĂ„ngban Mine, LĂ„ngban Ore District, Filipstad, VĂ€rmland County, Sweden