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Wiklundite

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About WiklunditeHide

Formula:
Pb2[4](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


Classification of WiklunditeHide

Approved, Pending publication
Approval Year:
2015

Physical Properties of WiklunditeHide

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}
Parting:
not observed
Fracture:
Irregular/Uneven
Density:
4.072 g/cm3 (Calculated)

Optical Data of WiklunditeHide

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

Chemical Properties of WiklunditeHide

Formula:
Pb2[4](Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6
IMA Formula:
Pb2(Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6

Crystallography of WiklunditeHide

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 ų
Z:
6
Twinning:
not observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.128(83)
4.052(58)
3.251(45)
3.098(81)
2.882(100)
2.805(90)
2.384(70)
2.320(56)

Type Occurrence of WiklunditeHide

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:

Synonyms of WiklunditeHide

Fluorescence of WiklunditeHide

non-fluorescent

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for WiklunditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cooper, M.A., Hawthorne, F.C., Langhof,J., Hålenius,U. and Holtstam,D.(2015) Wiklundite, IMA2015-057. CNMNC Newsletter No. 27, October 2015, page 1227; Mineralogical Magazine: 79: 1229–1236.
Cooper, M.A., Hawthorne, F.C., Langhof, J., Hålenius, 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 Långban, Filipstad, Värmland, Sweden: Description and crystal structure. Mineralogical Magazine 81, 841-855.

Internet Links for WiklunditeHide

Localities for WiklunditeHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Sweden (TL)
 
  • Värmland
    • Filipstad
Cooper, M.A., Hawthorne, F.C., Langhof,J., Hålenius,U. and Holtstam,D.(2015) Wiklundite, IMA2015-057.CNMNC Newsletter No. 27, October 2015, page 1227; Mineralogical Magazine, 79, 1229–1236; Cooper, M.A., Hawthorne, F.C., Langhof, J., Hålenius, 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 Långban, Filipstad, Värmland, Sweden: Description and crystal structure. Mineralogical Magazine 81, 841-855.
Mineral and/or Locality  
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