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 % 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.

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-WÃ¼rttemberg, 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

$Help on X Ray Diffraction:$ 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

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:

PE_Agardite-(Y)= 39.59 barns/electron
U=PE_Agardite-(Y) x rElectron 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 ï¿½ 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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