Goudeyite Mineral Data

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.

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:

HexagonalSpace 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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Goudeyite

Electron Density:

r_electron=3.39 gm/cc
note: r_Goudeyite=3.58 gm/cc.

Fermion Index

Fermion Index = 0.00016
Boson Index = 0.99984

Photoelectric:

PE_Goudeyite= 35.69 barns/electron
U=PE_Goudeyite x r_electron= 121.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Goudeyite is Not Radioactive

Goudeyite Classification

Dana Class:

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

(42.5)where (A)2 (XO4) Zq · x(H2O)

(42.5.1)Mixite group (Arsenate Series)

42.5.1.1 Mixite BiCu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

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

42.5.1.2a Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

42.5.1.2b Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m

42.5.1.2c Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m

42.5.1.2d Agardite-(Ca)! CaCu6(AsO4)3(OH)6·3(H2O) 6/m

42.5.1.2e Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

42.5.1.3 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6·3(H2O) Unk Hex

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

42.5.1.6 IMA2003-031a! (Pb,REE,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

Strunz Class:

VII/D.53-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.53 - Mixite - Agardite group

VII/D.53-10 Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-20 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6·3(H2O) Unk Hex

VII/D.53-30 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]·3(H2O) P 6₃/m 6/m

VII/D.53-40 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-50 Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-60 Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-70 Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m

VII/D.53-80 Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m

VII/D.53-90 Mixite BiCu6(AsO4)3(OH)6·3(H2O) P 6₃/m 6/m

VII/D.53-95 Juanitaite! (Cu,Ca,Fe)10Bi(AsO4)4(OH)11·2(H2O) P 4₁/nnm 4/m 2/m 2/m

VII/D.53-100 Mrazekite Bi2Cu3(PO4)2O2(OH)2·2(H2O) P 2₁/n 2/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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Goudeyite

(Al,Y)Cu6(AsO4)3(OH)6·3(H2O)
Dana No: 42.5.1.3 Strunz No: VII/D.53-20
Locality:

Notes: