Hydrowoodwardite Mineral Data

Lapis Mineral Journal

General Hydrowoodwardite Information

Chemical Formula:

Cu1-xAlx(OH)2(SO4)x/2•n(H2O) with 0 < x < 0.67 and n > 3x/2

Composition:

Molecular Weight = 116.81 gm

Aluminum 11.55 % Al 21.82 % Al₂O₃

Copper 27.20 % Cu 30.63 % Cu₂O

Hydrogen 3.02 % H 26.99 % H₂O

Sulfur 6.86 % S 17.14 % SO₃

Oxygen 51.37 % O

______ ______

100.00 % 96.58 % = TOTAL OXIDE

Empirical Formula:

Cu_0.5Al_0.5(OH)₂(SO₄)_0.25•0.75(H₂O)

Environment:

Member of the Hydrotalcite group. The copper dominant analog of carrboydite and glaucocerinite.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

St. Briccius Cu, Ag, Sn mine, Königswalde, near Annaberg, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named as the higher hydrated analogue of woodwardite.

Synonym:

IMA1996-038

Hydrowoodwardite Image

Images:

Hydrowoodwardite

Comments: Massive blue to greenish-blue hydrowoodwardite.
Location: St Christoph Mine, Bärenhecke, Glashütte, Erzgebirge, Saxony, Germany. Scale: Specimen size 3.4 cm.
© Thomas Witzke / Abraxas-Verlag

Hydrowoodwardite Crystallography

Axial Ratios:

a:c = 1:10.39087

Cell Dimensions:

a = 3.07, c = 31.9, Z = 3; V = 260.37 Den(Calc)= 2.23

Crystal System:

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

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

By Intensity(I/I_o): 10.5(1), 5.26(0.17), 3.5(0.06),

Physical Properties of Hydrowoodwardite

Color:

Blue, Pale blue.

Density:

2.33

Diaphaneity:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Hydrowoodwardite

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2498,KPDmeas= 0.2391,KC= 0.2389
Ncalc = 1.53 - 1.56

Optical Data:

Uniaxial (+), w=1.549, e=1.565, bire=0.0160.

Calculated Properties of Hydrowoodwardite

Electron Density:

Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Hydrowoodwardite =2.33 gm/cc.

Fermion Index:

Fermion Index = 0.0007658167
Boson Index = 0.9992341833

Photoelectric:

PE_{Hydrowoodwardite}= 12.28 barns/electron
U=PE_{Hydrowoodwardite} x rElectron Density= 28.66 barns/cc.

Radioactivity:

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

Hydrowoodwardite Classification

Dana Class:

31.02.02.02 (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 Hydrowoodwardite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(MinRec, V 31, No 2) OPTIC PROP.(MinRec, V 31, No. 2)

See Also:

Links to other databases for Hydrowoodwardite :
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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Hydrowoodwardite

Cu1-xAlx(OH)2(SO4)x/2•n(H2O) with 0 < x < 0.67 and n > 3x/2
Dana No: 31.02.02.02 Strunz No: 07.DD.35
Locality:

Notes: