Wermlandite
A valid IMA mineral species
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About Wermlandite
Formula:
Mg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O
May contain some carbonate(?).
Colour:
Green-gray
Lustre:
Waxy
Hardness:
1½
Specific Gravity:
1.932
Crystal System:
Trigonal
Member of:
Name:
Named after its discovery locality, LĂ„ngban, VĂ€rmland (Wermland), Sweden.
This is a genuinely rare species. Almost all specimens labeled "wermlandite" prove to be pyroaurite on analysis.
Unique Identifiers
Mindat ID:
4271
Long-form identifier:
mindat:1:1:4271:6
GUID
(UUID V4):
(UUID V4):
054a931d-be3f-4616-99f9-0daea5842617
IMA Classification of Wermlandite
Approved
IMA Formula:
Mg7Al2(OH)18[Ca(H2O)6](SO4)2 · 6H2O
Approval year:
1970
First published:
1971
Type description reference:
Classification of Wermlandite
7.DD.35
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
31.3.2.1
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)5(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)5(XO4)Zq·xH2O
11.7.10
11 : Carbonates
7 : Carbonates of Al
11 : Carbonates
7 : Carbonates of Al
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMAâCNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMAâCNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Wld | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Wld | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261â264 doi:10.1180/clm.2020.30 |
Physical Properties of Wermlandite
Waxy
Transparency:
Translucent
Colour:
Green-gray
Streak:
White to light gray green
Hardness:
1½ on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
Perfect on {0001}
Perfect on {0001}
Fracture:
Micaceous
Density:
1.932 g/cm3 (Measured) 1.96 g/cm3 (Calculated)
Optical Data of Wermlandite
Type:
Uniaxial (-)
RI values:
nω = 1.493 nε = 1.482
2V:
Measured: 2° to 5°
Birefringence:
0.011
Max Birefringence:
δ = 0.011
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
Parallel
Chemistry of Wermlandite
Mindat Formula:
Mg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O
May contain some carbonate(?).
May contain some carbonate(?).
Crystallography of Wermlandite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3c1
Setting:
P3c1
Cell Parameters:
a = 9.303(3) Å, c = 22.57(1) Å
Ratio:
a:c = 1 : 2.426
Unit Cell V:
1,691.64 Ă
Âł (Calculated from Unit Cell)
Z:
2
Morphology:
Thin pseudohexagonal platy crystals
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0010871 | Wermlandite | Rius J, Allmann R (1984) The superstructure of the double layer mineral wermlandite [Mg7(Al0.57,Fe3+0.43)2(OH)18]2+[(Ca0.6,Mg0.4)(SO4)2(H2O)12]2- Zeitschrift fur Kristallographie 168 133-144 | 1984 | Langban, Warmland, Sweden | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
11.2 Ă | (70) |
7.98 Ă | (100) |
5.62 Ă | (40) |
4.63 Ă | (50) |
3.89 Ă | (40) |
2.61 Ă | (40) |
1.54 Ă | (40) |
1.51 Ă | (30) |
Comments:
ZK 168:133 (1984)
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-đ alteration and/or metamorphism | |
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47b : [Sulfates and sulfites] |
Type Occurrence of Wermlandite
General Appearance of Type Material:
Plates up to 1 cm in diameter, with breadth to thickness 20:1, implanted along large calcite crystals.
Place of Conservation of Type Material:
1) Swedish Museum of Natural History, Stockholm, Sweden, 38001.
2) National Museum of Natural History, Washington, D.C., USA, 137023, 149523.
2) National Museum of Natural History, Washington, D.C., USA, 137023, 149523.
Geological Setting of Type Material:
Low temperature vein filling in calcite.
Associated Minerals at Type Locality:
Reference:
Moore, P.B. (1971) Wermlandite, a new mineral from LĂ„ngban, Sweden. Lithos: 4: 213-217.
Synonyms of Wermlandite
Other Language Names for Wermlandite
Relationship of Wermlandite to other Species
Member of:
Other Members of this group:
Erssonite | Mg7Fe3+2(OH)18[Ca(H2O)6](SO4)2 · 12H2O | Trig. 3m (3 2/m) : P3c1 |
Motukoreaite | Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O | Trig. 3m (3 2/m) : R3m |
Natroglaucocerinite | Zn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Hex. |
Nikischerite | Fe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Trig. 3 : R3 |
Shigaite | Mn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Trig. 3 : R3 |
Common Associates
Related Minerals - Strunz-mindat Grouping
7.DD. | Asagiite | NiCu4(SO4)2(OH)6 · 6H2O |
7.DD.05 | FelsĆbĂĄnyaite | Al4(SO4)(OH)10 · 4H2O |
7.DD.07 | Llantenesite | Cu6Al[SeO4](OH)12Cl · 3H2O |
7.DD.10 | Langite | Cu4(SO4)(OH)6 · 2H2O |
7.DD.10 | Posnjakite | Cu4(SO4)(OH)6 · H2O |
7.DD.10 | Wroewolfeite | Cu4(SO4)(OH)6 · 2H2O |
7.DD.10 | Gobelinite | CoCu4(SO4)2(OH)6 · 6H2O |
7.DD.10 | Fehrite | MgCu4(SO4)2(OH)6 · 6H2O |
7.DD.15 | Spangolite | Cu6Al(SO4)(OH)12Cl · 3H2O |
7.DD.15 | Kobyashevite | Cu5(SO4)2(OH)6 · 4H2O |
7.DD.15 | Unnamed (Dimorph of Devilline) | CaCu4(SO4)2(OH)6 · 3H2O |
7.DD.20 | Ktenasite | ZnCu4(SO4)2(OH)6 · 6H2O |
7.DD.25 | Christelite | Cu2Zn3(SO4)2(OH)6 · 4H2O |
7.DD.30 | Campigliaite | Mn2+Cu4(SO4)2(OH)6 · 4H2O |
7.DD.30 | Devilline | CaCu4(SO4)2(OH)6 · 3H2O |
7.DD.30 | Orthoserpierite | Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O |
7.DD.30 | Serpierite | Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O |
7.DD.30 | Niedermayrite | CdCu4(SO4)2(OH)6 · 4H2O |
7.DD.30 | Edwardsite | Cu3Cd2(SO4)2(OH)6 · 4H2O |
7.DD.35 | Carrboydite | (Ni1-xAlx)(SO4)x/2(OH)2 · nH2O |
7.DD.35 | Glaucocerinite | (Zn1-xAlx)(OH)2(SO4)x/2 · nH2O |
7.DD.35 | Honessite | (Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2O |
7.DD.35 | Hydrohonessite | (Ni1-xFe3+x)(OH)2(SO4)x/2 · nH2O |
7.DD.35 | Motukoreaite | Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O |
7.DD.35 | Mountkeithite | [(Mg1-xFe3+x)(OH)2][SO4]x/2 · nH2O |
7.DD.35 | Shigaite | Mn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
7.DD.35 | Woodwardite | Cu1-xAlx(OH)2(SO4)x/2 · nH2O |
7.DD.35 | Zincaluminite | Zn6Al6(SO4)2(OH)16 · 5H2O |
7.DD.35 | Hydrowoodwardite | (Cu1-xAlx)(OH)2[SO4]x/2 · nH2O |
7.DD.35 | Zincowoodwardite | Zn1-xAlx(OH)2[SO4]x/2 · nH2O |
7.DD.35 | Natroglaucocerinite | Zn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
7.DD.35 | Nikischerite | Fe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
7.DD.40 | Isselite | Cu6(SO4)(OH)10 · 5H2O |
7.DD.40 | Lawsonbauerite | (Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2O |
7.DD.40 | Torreyite | (Mg,Mn2+)7â»2Mn2+2Zn4(SO4)2(OH)22 · 8H2O |
7.DD.45 | Mooreite | Mg9â»2Mn2Zn4(SO4)2(OH)26 · 8H2O |
7.DD.45 | Hodgesmithite | (Cu,Zn)6Zn(SO4)2(OH)10 · 3H2O |
7.DD.47 | Lahnsteinite | Zn4(SO4)(OH)6 · 3H2O |
7.DD.50 | Namuwite | Zn4(SO4)(OH)6 · 4H2O |
7.DD.50 | Minohlite | (Cu,Zn)7(SO4)2(OH)10 · 8H2O |
7.DD.52 | Lauraniite | Cu6Cd2(SO4)2(OH)12 · 5H2O |
7.DD.55 | Bechererite | Zn7Cu(OH)13[(SiO(OH)3(SO4)] |
7.DD.60 | Ramsbeckite | (Cu,Zn)15(SO4)4(OH)22 · 6H2O |
7.DD.65 | Vonbezingite | Ca6Cu3(SO4)3(OH)12 · 2H2O |
7.DD.70 | Redgillite | Cu6(SO4)(OH)10 · H2O |
7.DD.75 | Chalcoalumite | CuAl4(SO4)(OH)12 · 3H2O |
7.DD.75 | Nickelalumite | NiAl4(SO4)(OH)12(H2O)3 |
7.DD.75 | Kyrgyzstanite | ZnAl4(SO4)(OH)12 · 3H2O |
7.DD.80 | Guarinoite | Zn6(SO4)(OH)10 · 5H2O |
7.DD.80 | Schulenbergite | (Cu,Zn)7(SO4)2(OH)10 · 3H2O |
7.DD.80 | ThérÚsemagnanite | NaCo4(SO4)(OH)6Cl · 6H2O |
7.DD.80 | UM1992-30-SO:CCuHZn | (Zn,Cu)7(SO4,CO3)2(OH)10 · 3H2O |
7.DD.85 | Montetrisaite | Cu6(SO4)(OH)10 · 2H2O |
Fluorescence of Wermlandite
Not 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 Wermlandite
mindat.org URL:
https://www.mindat.org/min-4271.html
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References for Wermlandite
Localities for Wermlandite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Sweden (TL) | |
| Lithos (1971) +1 other reference |
| Linden (2002) |
Ăstra VĂ€rmlands Mineral Society |
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LĂ„ngban Mine, LĂ„ngban Ore District, Filipstad, VĂ€rmland County, Sweden