Goudeyite
A valid IMA mineral species
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About Goudeyite
Formula:
AlCu6(AsO4)3(OH)6 · 3H2O
Al may be replaced by minor Y and other REE.
Colour:
blue-green, yellow-green
Hardness:
3 - 4
Specific Gravity:
3.50
Crystal System:
Hexagonal
Member of:
Name:
Named in honor of Hatfield Goudey (13 December 1906, Red Bank, New Jersey, USA – 11 April 1985, Mateo, California, USA), economic geologist, mineral collector and dealer in microscopic specimens, San Mateo, California, USA, who contributed to the knowledge of the type locality. He was elected to the Micromounter's Hall of Fame in 2003.
Unique Identifiers
Mindat ID:
1732
Long-form identifier:
mindat:1:1:1732:5
IMA Classification of Goudeyite
Approved
IMA Formula:
Cu2+6Al(As5+O4)3(OH)6·3H2O
Approval year:
1978
First published:
1978
Classification of Goudeyite
8.DL.15
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
42.5.1.3
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)7(XO4)3Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)7(XO4)3Zq·xH2O
20.4.15
20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Gdy | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Goudeyite
Transparency:
Translucent
Colour:
Blue-green, yellow-green
Streak:
Greenish white
Hardness:
3 - 4 on Mohs scale
Density:
3.50(3) g/cm3 (Measured) 3.49 g/cm3 (Calculated)
Comment:
Berman balance on fragments of 8 mg in toluene at 22 C.
Optical Data of Goudeyite
Type:
Uniaxial (+)
RI values:
nω = 1.704 - 1.705 nε = 1.765 - 1.772
Max. Birefringence:
δ = 0.061 - 0.067
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Weak
Comments:
O = pale yellow-green; E = green.
Chemistry of Goudeyite
Mindat Formula:
AlCu6(AsO4)3(OH)6 · 3H2O
Al may be replaced by minor Y and other REE.
Al may be replaced by minor Y and other REE.
Element Weights:
Crystallography of Goudeyite
Crystal System:
Hexagonal
Cell Parameters:
a = 13.472(1) Å, c = 5.902(4) Å
Ratio:
a:c = 1 : 0.438
Unit Cell V:
927.67 ų (Calculated from Unit Cell)
Z:
2
Comment:
Point Group: 6/m or 6 (probable); Space Group: [P63/m or P63] (by analogy to mixite)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.63 Å | (100) |
| 2.920 Å | (50) |
| 3.235 Å | (46) |
| 2.546 Å | (46) |
| 4.41 Å | (43) |
| 2.677 Å | (42) |
| 3.367 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Goudeyite
General Appearance of Type Material:
hair-like crystals, encrusting fractures and as cross-fiber veinlets
Place of Conservation of Type Material:
University of California, Santa Barbara, USA (specimen #8091).
Cotype material in the National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA.
Cotype material in the National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA.
Associated Minerals at Type Locality:
Synonyms of Goudeyite
Other Language Names for Goudeyite
Relationship of Goudeyite to other Species
Member of:
Other Members of Mixite Group:
| Agardite-(Ce) | CeCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Agardite-(La) | LaCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Agardite-(Nd) | NdCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Agardite-(Y) | YCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Calciopetersite | CaCu6(PO4)2(PO3OH)(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Mixite | BiCu6(AsO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Petersite-(Ce) | CeCu6(PO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Petersite-(La) | LaCu6(PO4)3(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Petersite-(Y) | YCu6(PO4)3(OH)6 · 3H2O | Hex. |
| Plumboagardite | PbCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O | Hex. 6/m : P63/m |
| Zálesíite | CaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O | Hex. 6/m : P63/m |
Common Associates
Associations Based on Photo Data:
| 8 photos of Goudeyite associated with Baryte | BaSO4 |
| 5 photos of Goudeyite associated with Quartz | SiO2 |
| 5 photos of Goudeyite associated with Olivenite | Cu2(AsO4)(OH) |
| 4 photos of Goudeyite associated with Kaolinite | Al2(Si2O5)(OH)4 |
| 3 photos of Goudeyite associated with Zálesíite | CaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 3 photos of Goudeyite associated with Clinoclase | Cu3(AsO4)(OH)3 |
| 3 photos of Goudeyite associated with Arsenogorceixite | BaAl3(AsO4)(AsO3OH)(OH)6 |
| 3 photos of Goudeyite associated with Bayldonite | PbCu3(AsO4)2(OH)2 |
| 3 photos of Goudeyite associated with Cornubite | Cu5(AsO4)2(OH)4 |
| 3 photos of Goudeyite associated with Goethite | Fe3+O(OH) |
Related Minerals - Strunz-mindat Grouping
| 8.DL.05 | Foggite | CaAl(PO4)(OH)2 · H2O |
| 8.DL.10 | Fluorowardite | NaAl3(PO4)2F2(OH)2(H2O)2 |
| 8.DL.10 | Wardite | NaAl3(PO4)2(OH)4 · 2H2O |
| 8.DL.10 | Millisite | (Na,K)CaAl6(PO4)4(OH)9 · 3H2O |
| 8.DL.10 | Cyrilovite | NaFe3+3(PO4)2(OH)4 · 2H2O |
| 8.DL.15 | Petersite-(Ce) | CeCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Nd) | NdCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Y) | YCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Ce) | CeCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | 'Agardite-(Dy)' | (Dy,La)Cu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(La) | LaCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Petersite-(Y) | YCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Zálesíite | CaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Mixite | BiCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Petersite-(La) | LaCu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Calciopetersite | CaCu6(PO4)2(PO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Plumboagardite | PbCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 8.DL.20 | Dugganite | Pb3Zn3(AsO4)2(TeO6) |
| 8.DL.20 | Wallkilldellite | Ca2Mn2+3(AsO4)2(OH)4 · 9H2O |
| 8.DL.20 | Wallkilldellite-(Fe) | (Ca,Cu)4Fe2+6(AsO4,SiO4)4(OH,O)8 · 18H2O |
| 8.DL.20 | Cheremnykhite | Pb3Zn3(VO4)2(TeO6) |
| 8.DL.20 | Kuksite | Pb3Zn3(PO4)2(TeO6) |
| 8.DL.25 | Angastonite | CaMgAl2(PO4)2(OH)4 · 7H2O |
| 8.DL.30 | Långbanshyttanite | Pb2Mn2Mg(AsO4)2(OH)4 · 6H2O |
Other Information
Notes:
Dissolves slowly in dilute HCl
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Goudeyite
mindat.org URL:
https://www.mindat.org/min-1732.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Goudeyite
Reference List:
Wise, William S. (1978) Parnauite and goudeyite, two new copper arsenate minerals from the Majuba Hill Mine, Pershing County, Nevada. American Mineralogist, 63 (7-8) 704-708
Frost, Ray L., Weier, Matt, Martens, Wayde N. (2006) Raman microscopy of synthetic goudeyite (YCu6(AsO4)2(OH)6·3H2O) Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 63 (3) 685-689 doi:10.1016/j.saa.2005.06.019[NOTE: the paper deals with synthetic agardite-(Y); the authors completely misunderstood the nomenclature in this group]
Golubev, Aleksandr, Brücher, Eva, Schulz, Armin, Kremer, Reinhard K., Schmidt, Franz X., Gordon, Elija E., Whangbo, Myung-Hwan (2018) Low-Dimensional Magnetic Properties of Natural and Synthetic Mixite (Bi,Ca)Cu6(OH)6(AsO4)3·nH2O (n ≈ 3) and Goudeyite YCu6(OH)6(AsO4)3·nH2O (n ≈ 3). Zeitschrift für anorganische und allgemeine Chemie, 644. 1782-1790 doi:10.1002/zaac.201800344
Localities for Goudeyite
Showing 30 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Brazil | |
| Moura et al. (2007) +1 other reference |
Chile | |
| Dr. Bob Jenkins collection +2 other references |
| Dakota Matrix Mineral catalogue 2010 | |
Czech Republic | |
| Jakub Plasil |
| Plášil et al. (2014) |
France | |
| Issn 0036-7699 +9 other references |
| Favreau G. et al. (1996) |
| Meisser et al. (2008) +1 other reference |
| Lheur (2023) |
| www.mine-capgaronne.fr (2003) |
Germany | |
| Kolitsch et al. (2019) |
| ... |
| Weiß (1990) |
Greece | |
| Branko Rieck analysis |
| |
Italy | |
| Guastoni (2009) |
| Guastoni A. (2009) | |
| Stara et al. (1993) |
| Lecca et al. (2024) |
| Conedera M. et al. (2016) |
| Vecchi et al. (2013) |
Japan | |
| Royal Ontario Museum specimen (obtained november 1982 from Hori Mineralogy, Tokyo) |
Russia | |
| Kasatkin et al. (2014) |
South Africa | |
| "Rick Turner Collection" |
Spain | |
| Georges FAVREAU collection and EDX ... |
| Calvo Rebollar et al. (2022) |
Switzerland | |
| Meisser N. et al. (2020) |
USA | |
| R. Housley (2008) |
| Wise (1978) +2 other references |
| - (n.d.) |
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Sherlova Gora, Adun-Cholon Range, Nerchinsky District, Zabaykalsky Krai, Russia