Goudeyite Mineral Data

General Goudeyite Information

Chemical Formula:

(Al,Y)Cu6(AsO4)3(OH)6•3(H2O)

Composition:

Molecular Weight = 999.68 gm

Yttrium 2.67 % Y 3.39 % Y₂O₃

Aluminum 1.89 % Al 3.57 % Al₂O₃

Copper 38.14 % Cu 47.74 % CuO

Arsenic 22.48 % As 34.49 % As₂O₅

Hydrogen 1.21 % H 10.81 % H₂O

Oxygen 33.61 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al_0.7Y_0.3Cu₆(AsO₄)₃(OH)₆•3(H₂O)

Environment:

Al analog of agardite.

IMA Status:

Approved IMA 1978

Locality:

Majuba Hill mine, Pershing County, Nevada, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Hatfield Goudey (1906-1985), mining geologist and mineral collector of San Mateo, California, USA.

Name Pronunciation:

Goudeyite + Pronunciation

Goudeyite Image

Images:

Goudeyite

Comments: Green crusts and micro crystals of goudeyite on matrix.
Location: Majuba Hill, Pershing County, Nevada, USA. Scale: Specimen size 1x3 cm.
© John Veevaert

Goudeyite Crystallography

Axial Ratios:

a:c = 1:0.43809

Cell Dimensions:

a = 13.472, c = 5.902, Z = 2; V = 927.67 Den(Calc)= 3.58

Crystal System:

Hexagonal Space Group: Unk

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

By Intensity(I/I_o): 11.63(1), 2.92(0.5), 3.235(0.45),

Physical Properties of Goudeyite

Cleavage:

{100} Perfect, {001} Good

Color:

Colorless, Yellow green.

Density:

3.5

Diaphaneity:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

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

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

greenish white

Optical Properties of Goudeyite

Dichroism (e):

pale yellow green.

Dichroism (w):

green.

Gladstone-Dale:

CI meas= -0.123 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.097 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2052,KPDmeas= 0.2099,KC= 0.1869
Ncalc = 1.65 - 1.67

Optical Data:

Uniaxial (+), w=1.704, e=1.765, bire=0.0610.

Calculated Properties of Goudeyite

Electron Density:

Bulk Density (Electron Density)=3.39 gm/cc
note: Specific Gravity of Goudeyite =3.58 gm/cc.

Fermion Index:

Fermion Index = 0.0001631401
Boson Index = 0.9998368599

Photoelectric:

PE_Goudeyite= 35.69 barns/electron
U=PE_Goudeyite x rElectron Density= 121.11 barns/cc.

Radioactivity:

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

Goudeyite Classification

Dana Class:

42.05.01.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.05)where (A)2 (XO4) Zq � x(H2O)

(42.05.01)Mixite group (Arsenate Series)

42.05.01.01 Mixite BiCu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

42.05.01.02 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

42.05.01.02a Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

42.05.01.02b Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m

42.05.01.02c Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m

42.05.01.02d Agardite-(Ca)! CaCu6(AsO4)3(OH)6•3(H2O) 6/m

42.05.01.02e Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

42.05.01.03 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6•3(H2O) Unk Hex

42.05.01.04 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]•3(H2O) P 6₃/m 6/m

42.05.01.06 Plumboagardite! (Pb,REE,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

Strunz Class:

08.DL.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DL -With large and medium-sized cations, (OH, etc.):RO4 = 2:1

08.DL.15 Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m

08.DL.15 Agardite-(Ca)! CaCu6(AsO4)3(OH)6•3(H2O) 6/m

08.DL.15 Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m

08.DL.15 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6•3(H2O) Unk Hex

08.DL.15 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]•3(H2O) P 6₃/m 6/m

08.DL.15 Mixite BiCu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6•3(H2O) P 6₃/m 6/m

08.DL.15 Calciopetersite! CaCu6[(PO4)2(PO3OH)(OH)6]•3(H2O) P 6₃/m 6/m

08.DL.15 Plumboagardite! (Pb,REE,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 6₃/m 6/m

Other Goudeyite 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 Goudeyite :
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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Goudeyite

(Al,Y)Cu6(AsO4)3(OH)6•3(H2O)
Dana No: 42.05.01.03 Strunz No: 08.DL.15
Locality:

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