Woodwardite Mineral Data

General Woodwardite Information

Chemical Formula:

Cu4Al2(SO4)(OH)12•2-4(H2O)

Composition:

Molecular Weight = 662.34 gm

Aluminum 8.15 % Al 15.39 % Al₂O₃

Copper 38.38 % Cu 48.04 % CuO

Hydrogen 2.74 % H 24.48 % H₂O

Sulfur 4.84 % S 12.09 % SO₃

Oxygen 45.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₄Al₂(SO₄)(OH)₁₂•3(H₂O)

Environment:

Inadequately characterized mineral. Post mining alteration product.

IMA Status:

Valid Species (Pre-IMA) 1866

Locality:

Cornwall, England. Link to MinDat.org Location Data.

Name Origin:

Named for Samuel P. Woodward (1821-1865), English naturalist and geologist.

Name Pronunciation:

Woodwardite + Pronunciation

Woodwardite Image

Images:

Woodwardite

Comments: Greenish-blue botryoidal crust of woodwardite.
Location: Green River Formation, Uintah Co., Utah, USA. Scale: Picture size 1.8 mm.
© Thomas Witzke / Abraxas-Verlag

Woodwardite Crystallography

Axial Ratios:

a:c = 1:4.54999

Cell Dimensions:

a = 6, c = 27.3, Z = 2; V = 851.13 Den(Calc)= 2.58

Crystal System:

Hexagonal Space Group: Unk

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

By Intensity(I/I_o): 10.9(1), 5.46(0.6), 3.66(0.5),

Physical Properties of Woodwardite

Color:

Greenish blue, Turquoise.

Density:

2.38

Diaphaneity:

Translucent

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Fibrous - Crystals made up of fibers.

Streak:

light blue

Optical Properties of Woodwardite

Gladstone-Dale:

CI meas= -0.089 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2192,KPDmeas= 0.2376,KC= 0.2182
Ncalc = 1.52 - 1.56

Optical Data:

Biaxial (+), a=1.552-1.571, b=1.555-1.574, g=1.565-1.576, bire=0.0050-0.0130

Calculated Properties of Woodwardite

Electron Density:

Bulk Density (Electron Density)=2.56 gm/cc
note: Specific Gravity of Woodwardite =2.58 gm/cc.

Fermion Index:

Fermion Index = 0.0005875053
Boson Index = 0.9994124947

Photoelectric:

PE_Woodwardite= 16.93 barns/electron
U=PE_Woodwardite x rElectron Density= 43.27 barns/cc.

Radioactivity:

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

Woodwardite Classification

Dana Class:

31.02.02.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.02)where (A+ B++)6 (XO4) Zq�x(H2O)

(31.02.02)Woodwardite Group

31.02.02.01 Woodwardite Cu4Al2(SO4)(OH)12•2-4(H2O) Unk Hex

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

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

31.02.02.03a Zincowoodwardite-1T! [Zn1BxAlx(OH)2][(SO4)x/2•n(H2O)],x=0.33,n.0.96 P 3 3

31.02.02.03b Zincowoodwardite-3R! [Zn1BxAlx(OH)2][(SO4)x/2•n(H2O)],0.32<x<0.50,n=0.59 R 3m 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 Woodwardite 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 Woodwardite :
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

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

Woodwardite

Cu4Al2(SO4)(OH)12•2-4(H2O)
Dana No: 31.02.02.01 Strunz No: 07.DD.35
Locality:

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