Wermlandite Mineral Data

General Wermlandite Information

Chemical Formula:

(Ca,Mg)Mg7(Al,Fe+++)2(SO4)2(OH)18•12(H2O)

Composition:

Molecular Weight = 989.11 gm

Calcium 3.04 % Ca 4.25 % CaO

Magnesium 17.82 % Mg 29.54 % MgO

Aluminum 4.09 % Al 7.73 % Al₂O₃

Iron 2.82 % Fe 4.04 % Fe₂O₃

Hydrogen 4.28 % H 38.25 % H₂O

Sulfur 6.48 % S 16.19 % SO₃

Oxygen 61.47 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_0.75Mg_7.25Al_1.5Fe³⁺_0.5(SO₄)₂(OH)₁₈•12(H₂O)

Environment:

Associated with calcite and magnetite.

IMA Status:

Approved IMA 1971

Locality:

Långban mine, Bergslagen ore district, Filipstad, Värmland (Wermland), Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Name Pronunciation:

Wermlandite + Pronunciation

Synonym:

ICSD 30887

PDF 25-153

Wermlandite Image

Images:

Wermlandite

Comments: Dark colored, hexagonal platelet of wermlandite on matrix.
Location: Langban, Varmland, Sweden. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Wermlandite Crystallography

Axial Ratios:

a:c = 1:2.42609

Cell Dimensions:

a = 9.303, c = 22.57, Z = 2; V = 1,691.64 Den(Calc)= 1.94

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3c1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.98(1), 11.16(0.7), 4.63(0.5),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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H - Help Screen
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Rius J , Allmann R , Zeitschrift fur Kristallographie , 168 (1984) p.133-144, 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-, Locality: Langban, Warmland, Sweden

Physical Properties of Wermlandite

Cleavage:

{0001} Perfect

Color:

Bluish, Greenish gray.

Density:

1.932

Fracture:

Micaceous - Fracture of flexable micaceous cleavage fragments.

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Thin - Flat dimensioned crystals.

Hardness:

1.5 - Between Talc and Gypsum

Optical Properties of Wermlandite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2513,KPDmeas= 0.2523,KC= 0.2554
Ncalc = 1.49 - 1.5

Optical Data:

Uniaxial (-), e=1.482, w=1.493, bire=0.0110.

Calculated Properties of Wermlandite

Electron Density:

Bulk Density (Electron Density)=2.00 gm/cc
note: Specific Gravity of Wermlandite =1.93 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Wermlandite= 2.17 barns/electron
U=PE_Wermlandite x rElectron Density= 4.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wermlandite is Not Radioactive

Wermlandite Classification

Dana Class:

31.03.02.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.03)where (A+ B++)5 (XO4) Zq·x(H2O)

(31.03.02)Dana Group

31.03.02.01 Wermlandite (Ca,Mg)Mg7(Al,Fe)2(SO4)2(OH)18•12(H2O) P 3c1 3 2/m

Strunz Class:

07.DD.35 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DD -With only medium-sized cations; sheets of edge-sharing octahedra

07.DD.35 Carrboydite (Ni,Cu)14Al9(SO4,CO3)6(OH)43•7(H2O) Unk Hex

07.DD.35 Glaucocerinite (Zn,Cu)5Al3(SO4)1.5(OH)16•9(H2O) Unk (HEX-R) Trig

07.DD.35 Honessite Ni6Fe2(SO4)(OH)16•4(H2O) R 3m 3 2/m

07.DD.35 Hydrowoodwardite! Cu1-xAlx(OH)2(SO4)x/2•n(H2O)with0<x<0.67andn>3x/2 R 3m 3 2/m

07.DD.35 Zincowoodwardite! [Zn1-xAlx(OH)2][(SO4)x/2(H2O)n] P 3- or R 3m 3

07.DD.35 Hydrohonessite Ni6Fe2(SO4)(OH)16•7(H2O) Unk Hex

07.DD.35 Motukoreaite Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O) R 3m 3 2/m

07.DD.35 Mountkeithite (Mg,Ni)11(Fe,Cr)3(SO4,CO3)3.5(OH)24•11(H2O) Unk Hex

07.DD.35 Shigaite Mn7Al4(SO4)2(OH)22•8(H2O) R 3 3

07.DD.35 Natroglaucocerinite! (Na,Zn,Cu)10Al6(SO4)3(OH)32•18(H2O)? Unk

07.DD.35 Wermlandite (Ca,Mg)Mg7(Al,Fe)2(SO4)2(OH)18•12(H2O) P 3c1 3 2/m

07.DD.35 Nikischerite! NaFe6Al3(SO4)2(OH)18(H2O)12 R 3 3

07.DD.35 Zincaluminite Zn6Al6(SO4)2(OH)26•5(H2O) Unk Hex

07.DD.35 Woodwardite Cu4Al2(SO4)(OH)12•2-4(H2O) Unk Hex

07.DD.35 Zincowoodwardite-3R! [Zn1BxAlx(OH)2][(SO4)x/2•n(H2O)],0.32<x<0.50,n=0.59 R 3m 3 2/m

07.DD.35 Zincowoodwardite-1T! [Zn1BxAlx(OH)2][(SO4)x/2•n(H2O)],x=0.33,n.0.96 P 3 3

Other Wermlandite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Wermlandite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Scandinavian mineral gallery
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Wermlandite Specimen Label here :

Wermlandite

(Ca,Mg)Mg7(Al,Fe+++)2(SO4)2(OH)18•12(H2O)
Dana No: 31.03.02.01 Strunz No: 07.DD.35
Locality:

Notes: