Agardite-(Y) Mineral Data
General Agardite-(Y) Information
Chemical Formula:
(Y,Ca)Cu6(AsO4)3(OH)6•3(H2O)
Composition:
Molecular Weight = 1,030.82 gm
Calcium 0.97 % Ca 1.36 % CaO
Yttrium 6.47 % Y 8.21 % Y2 O3
Copper 36.99 % Cu 46.30 % CuO
Arsenic 21.80 % As 33.45 % As2 O5
Hydrogen 1.17 % H 10.49 % H2 O
Oxygen 32.59 % O
______ ______
100.00 % 99.81 % = TOTAL OXIDE
Empirical Formula:
Y0.75 Ca0.25 Cu6 (AsO4 )3 (OH)6 •3(H2 O)
IMA Status:
Approved IMA 1969
Locality:
Morocco, Bou Skour mine, Jebel Sarhro Link to MinDat.org Location Data.
Name Origin:
Named for the composition and for Jules Agard, Geologist, Bureau de Recherches Geologiques et Minieres, Orleans, France.
Name Pronunciation:
Agardite-(Y)
Synonym:
Chlorotile
ICSD 36476
PDF 25-183
Agardite-(Y) Image
Images:
Agardite-(Y)
Comments: Fibrous to fine acicular green micro crystals of agardite-(Y) (chlorotile) to 1mm.
Location: Clara mine, Wolfach, Schwarzwald, Baden-Württemberg, Germany.
Scale: Picture size 0.5 cm.
© Tom Loomis / Dakota Matrix
Agardite-(Y) Crystallography
Axial Ratios:
a:c = 1:0.43321
Cell Dimensions:
a = 13.55, c = 5.87, Z = 2; V = 933.36 Den(Calc)= 3.67
Crystal System:
Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P 63 /m
X Ray Diffraction:
By Intensity(I/Io ): 10.73(1), 2.451(0.8), 2.938(0.8),
Physical Properties of Agardite-(Y)
Color:
Blue green, Blue.
Density:
3.66 - 3.72, Average = 3.69
Diaphaneity:
Translucent
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Rosette - Bundled tabular aggregates resembling rose flower petals.
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
3-4 - Calcite-Fluorite
Luster:
Vitreous (Glassy)
Streak:
greenish white
Optical Properties of Agardite-(Y)
Dichroism (e):
colorless.
Dichroism (w):
colorless.
Gladstone-Dale:
CI meas = -0.084 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = -0.09 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.202,KPDmeas = 0.2009,KC = 0.1854 Ncalc = 1.68 - 1.69
Optical Data:
Uniaxial (+), w=1.701, e=1.782, bire=0.0810.
Calculated Properties of Agardite-(Y)
Electron Density:
Bulk Density (Electron Density)=3.49 gm/cc note: Specific Gravity of Agardite-(Y) =3.69 gm/cc.
Fermion Index:
Fermion Index = 0.0001713337 Boson Index = 0.9998286663
Photoelectric:
PEAgardite-(Y) = 39.59 barns/electronU=PEAgardite-(Y) x r Electron Density= 138.11 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Agardite-(Y) is Not Radioactive
Agardite-(Y) Classification
Dana Class:
42.05.01.02 (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 Agardite-(Y) Information
References:
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Agardite-(Y) :
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 (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST
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Agardite-(Y)
(Y,Ca)Cu6(AsO4)3(OH)6•3(H2O)
Dana No: 42.05.01.02 Strunz No: 08.DL.15
Locality:
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