Woodwardite Mineral Data

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.

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:

HexagonalSpace 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

Diaphaniety:

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

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:

r_electron=2.56 gm/cc
note: r_Woodwardite=2.58 gm/cc.

Fermion Index

Fermion Index = 0.00058
Boson Index = 0.99942

Photoelectric:

PE_Woodwardite= 16.93 barns/electron
U=PE_Woodwardite x r_electron= 43.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Woodwardite is Not Radioactive

Woodwardite Classification

Dana Class:

31.2.2.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.2)where (A+ B++)6 (XO4) Zq·x(H2O)

(31.2.2)Dana Group

31.2.2.1 Woodwardite Cu4Al2(SO4)(OH)12·2-4(H2O) Unk Hex

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

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

31.2.2.3a Zincowoodwardite-1T! [Zn1BxAlx(OH)2][(SO4)x/2·n(H2O)],x=0.33,n.0.96 P 3 3

31.2.2.3b 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:

VI/D.08-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.08 - Spangolite - Glaucocerinite series

VI/D.08-05 Bechererite! (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2 P 3 3

VI/D.08-10 Spangolite Cu6Al(SO4)(OH)12Cl·3(H2O) P 3₁c 3m

VI/D.08-20 Cyanotrichite Cu4Al2(SO4)(OH)12·2(H2O) Unk Ortho

VI/D.08-30 Carbonate-cyanotrichite Cu4Al2(CO3,SO4)(OH)12·2(H2O) Unk Ortho

VI/D.08-35 Camerolaite Cu4Al2[HSbO4,SO4](OH)10(CO3)·2(H2O) P 2₁ ? 2

VI/D.08-40 Woodwardite Cu4Al2(SO4)(OH)12·2-4(H2O) Unk Hex

VI/D.08-42 Hydrowoodwardite! Cu1-xAlx(OH)2(SO4)x/2·n(H2O)with0<x<0.67andn>3x/2 R 3m 3 2/m

VI/D.08-45 Zincowoodwardite! [Zn1-xAlx(OH)2][(SO4)x/2(H2O)n] P 3- or R 3m 3

VI/D.08-45* Zincowoodwardite-1T! [Zn1BxAlx(OH)2][(SO4)x/2·n(H2O)],x=0.33,n.0.96 P 3 3

VI/D.08-45** Zincowoodwardite-3R! [Zn1BxAlx(OH)2][(SO4)x/2·n(H2O)],0.32<x<0.50,n=0.59 R 3m 3 2/m

VI/D.08-50 Chalcoalumite CuAl4(SO4)(OH)12·3(H2O) P 2₁ 2

VI/D.08-60 Nickelalumite (Ni,Cu)Al4[(SO4),(NO3)2](OH)12·3(H2O) P 2₁ 2

VI/D.08-70 Mbobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12·3(H2O) P 2₁ 2

VI/D.08-80 Hydrombobomkulite (Ni,Cu)Al4(NO3,SO4)2(OH)12·14(H2O) Unk Mono

VI/D.08-90 Carrboydite (Ni,Cu)14Al9(SO4,CO3)6(OH)43·7(H2O) Unk Hex

VI/D.08-100 Zincaluminite Zn6Al6(SO4)2(OH)26·5(H2O) Unk Hex

VI/D.08-110 Glaucocerinite (Zn,Cu)5Al3(SO4)1.5(OH)16·9(H2O) Unk (HEX-R) Trig

Other Woodwardite Information

References:

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

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Woodwardite

Cu4Al2(SO4)(OH)12·2-4(H2O)
Dana No: 31.2.2.1 Strunz No: VI/D.08-40
Locality:

Notes: