Zincowoodwardite Mineral Data

General Zincowoodwardite Information

Chemical Formula:

[Zn1-xAlx(OH)2][(SO4)x/2(H2O)n]

Composition:

Molecular Weight = 103.10 gm

Aluminum 9.94 % Al 18.79 % Al₂O₃

Zinc 29.81 % Zn 37.10 % ZnO

Hydrogen 3.13 % H 27.96 % H₂O

Sulfur 5.60 % S 13.98 % SO₃

Oxygen 51.52 % O

______ ______

100.00 % 97.83 % = TOTAL OXIDE

Empirical Formula:

Zn_0.47Al_0.38(OH)₂(SO₄)_0.18(H₂O)_0.6

Environment:

Composed of intergrown 1T and 3R polytypes.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Laurion (Lavrion,Laurium), Greece. Link to MinDat.org Location Data.

Name Origin:

Named as the Zn analog of woodwardite.

Synonym:

IMA1998-026

Zincowoodwardite Image

Images:

Zaccagnaite Zincowoodwardite

Comments: White to pale bluish zaccagnaite intimately intergrown with zincowoodwardite.
Location: Hilarion Mine, Agios Konstantinos, Lavrion District, Attikí Prefecture, Greece. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Zincowoodwardite

Comments: Botryoidal zincowoodwardite. The bluish-green color is due to a copper content.
Location: Christiana Mine, Agios Konstantinos, Lavrion District, Attikí Prefecture, Greece. Scale: Picture size 10 mm.
© Thomas Witzke / Abraxas-Verlag

Zincowoodwardite Crystallography

Axial Ratios:

a:c = 1:2.91463

Cell Dimensions:

a = 3.0364, c = 8.85, Z = 1; V = 70.66 Den(Calc)= 2.42

Crystal System:

Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: P 3- or R 3m

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

By Intensity(I/I_o): 11.12(1), 5.549(0.24), 3.704(0.15),

Physical Properties of Zincowoodwardite

Cleavage:

None

Color:

Pale blue, Bluish white.

Density:

2.66 - 2.71, Average = 2.68

Diaphaneity:

Translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

1 - Talc

Luster:

Waxy

Streak:

pale bluish white

Optical Properties of Zincowoodwardite

Gladstone-Dale:

CI meas= 0.066 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2252,KPDmeas= 0.203,KC= 0.2173
Ncalc = 1.53 - 1.59

Optical Data:

Uniaxial (?), b=1.532-1.558.

Calculated Properties of Zincowoodwardite

Electron Density:

Bulk Density (Electron Density)=2.43 gm/cc
note: Specific Gravity of Zincowoodwardite =2.42 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Zincowoodwardite}= 14.95 barns/electron
U=PE_{Zincowoodwardite} x rElectron Density= 36.27 barns/cc.

Radioactivity:

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

Zincowoodwardite Classification

Dana Class:

31.02.02.03 (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 Zincowoodwardite Information

References:

NAME( AmMin, vol 86, p 769) PHYS. PROP.(AmMin, Vol 86, p 769) OPTIC PROP.(AmMin, Vol 86, p 769)

See Also:

Links to other databases for Zincowoodwardite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Zincowoodwardite

[Zn1-xAlx(OH)2][(SO4)x/2(H2O)n]
Dana No: 31.02.02.03 Strunz No: 07.DD.35
Locality:

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