Agardite-(Y) Mineral Data

Agardite-(Y) Mineral Data +

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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 % Y₂O₃

Copper 36.99 % Cu 46.30 % CuO

Arsenic 21.80 % As 33.45 % As₂O₅

Hydrogen 1.17 % H 10.49 % H₂O

Oxygen 32.59 % O

______ ______

100.00 % 99.81 % = TOTAL OXIDE

Empirical Formula:

Y_0.75Ca_0.25Cu₆(AsO₄)₃(OH)₆·3(H₂O)

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.

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-W?rttemberg, 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 - DipyramidalH-M Symbol (6/m) Space Group: P 6₃/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Diaphaniety:

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

Optical Data:

Uniaxial (+), w=1.701, e=1.782, bire=0.0810.

Calculated Properties of Agardite-(Y)

Electron Density:

r_electron=3.49 gm/cc
note: r_Agardite-(Y)=3.69 gm/cc.

Fermion Index

Fermion Index = 0.00017
Boson Index = 0.99983

Photoelectric:

PE_Agardite-(Y)= 39.59 barns/electron
U=PE_Agardite-(Y) x r_electron= 138.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Agardite-(Y) is Not Radioactive

Agardite-(Y) Classification

Dana Class:

42.5.1.2 (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.53-40 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 Agardite-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Agardite-(Y)

(Y,Ca)Cu6(AsO4)3(OH)6·3(H2O)
Dana No: 42.5.1.2 Strunz No: VII/D.53-40
Locality:

Notes: