Goudeyite Mineral Data +

Greenside Minerals

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:	Al0.7Y0.3Cu6(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
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
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:	relectron=3.39 gm/cc note: rGoudeyite =3.58 gm/cc.
Fermion Index	Fermion Index = 0.00016 Boson Index = 0.99984
Photoelectric:	PEGoudeyite = 35.69 barns/electron U=PEGoudeyite x relectron= 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 Search for Goudeyite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Goudeyite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Goudeyite Mineral Data : Ask about Goudeyite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Español Print or Cut-and-Paste your Goudeyite Specimen Label here : Goudeyite (Al,Y)Cu6(AsO4)3(OH)6·3(H2O) Dana No: 42.5.1.3 Strunz No: VII/D.53-20 Locality:   Notes: