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 % Y2 O3
Aluminum 1.89 % Al 3.57 % Al2 O3
Copper 38.14 % Cu 47.74 % CuO
Arsenic 22.48 % As 34.49 % As2 O5
Hydrogen 1.21 % H 10.81 % H2 O
Oxygen 33.61 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Al0.7 Y0.3 Cu6 (AsO4 )3 (OH)6 •3(H2 O)
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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEGoudeyite = 35.69 barns/electronU=PEGoudeyite x r Electron 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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