Agardite-(Ce) Mineral Data

Agardite-(Ce) Mineral Data +

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General Agardite-(Ce) Information

Chemical Formula:

(Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O)

Composition:

Molecular Weight = 1,070.95 gm

Calcium 0.86 % Ca 1.20 % CaO

Europium 0.28 % Eu 0.33 % Eu₂O₃

Lanthanum 1.95 % La 2.28 % La₂O₃

Cerium 4.32 % Ce 5.06 % Ce₂O₃

Samarium 0.42 % Sm 0.49 % Sm₂O₃

Gadolinium 0.44 % Gd 0.51 % Gd₂O₃

Dysprosium 0.15 % Dy 0.17 % Dy₂O₃

Yttrium 0.75 % Y 0.95 % Y₂O₃

Iron 0.26 % Fe 0.34 % FeO

Copper 34.30 % Cu 42.93 % CuO

Silicon 0.45 % Si 0.95 % SiO₂

Arsenic 20.15 % As 30.90 % As₂O₅

Hydrogen 1.24 % H 11.10 % H₂O

Sulfur 0.15 % S 0.34 % S₂O₅

Neodymium 2.02 % Nd 2.36 % Nd₂O₃

Oxygen 32.27 % O

______ ______

100.00 % 99.91 % = TOTAL OXIDE

Empirical Formula:

Ce_0.33Ca_0.23La_0.15Nd_0.15Y_0.09Sm_0.03Gd_0.03Eu_0.02Dy_0.01Cu_5.78Fe²⁺_0.05As_2.88Si_0.17S_0.05 O₁₂(OH)₆·3.6(H₂O)

Environment:

Oxidation products that formed on barite and quartz first noticed in 1970.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Clara mine, near Oberwolfach in the central Black Forest, Germany. Link to MinDat.org Location Data.

Name Origin:

Named as the Ce-dominant analog of agardite-(La) and agardite-(Y).

Synonym:

ICSD 31255

IMA2003-030

PDF 75-1695

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Agardite-(Ce) Crystallography

Axial Ratios:

a:c = 1:0.4334

Cell Dimensions:

a = 13.59, c = 5.89, Z = 2; V = 942.07 Den(Calc)= 3.78

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): 11.88(1)(100), 2.46(0.9)(212,321), 2.95(0.8)(221,400),3.56(0.8)(211), 4.47(0.8)(111,120), 2.57(0.5), 2.7(0.5),

Crystal Structure:

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Hess H , Neues Jahrbuch fur Mineralogie, Monatshefte , 1983 (1983) p.385-392, Die kristallstruktur des chlorotils, SECu6(AsO4)3(OH)6*3H2O, (SE = seltene erdmetalle), Locality: Clara mine, Black Forest, Baden-Wurttemberg, Germany

Physical Properties of Agardite-(Ce)

Cleavage:

None

Color:

Yellow green.

Density:

3.72

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

greenish white

Optical Properties of Agardite-(Ce)

Dichroism (e):

yellowish green.

Dichroism (w):

green.

Gladstone-Dale:

CI meas= -0.125 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.108 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.203,KPDmeas= 0.2063,KC= 0.1833

Optical Data:

Uniaxial (+), w=1.725, e=1.81, bire=0.0850.

Calculated Properties of Agardite-(Ce)

Electron Density:

r_electron=3.56 gm/cc
note: r_{Agardite-(Ce)}=3.78 gm/cc.

Fermion Index

Fermion Index = 0.00953
Boson Index = 0.99047

Photoelectric:

PE_{Agardite-(Ce)}= 80.44 barns/electron
U=PE_{Agardite-(Ce)} x r_electron= 285.99 barns/cc.

Radioactivity:

GRapi = 9,635.52 (Gamma Ray American Petroleum Institute Units)

Agardite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Agardite-(Ce)** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.96 cm	215,137	5.81E-06	9,635.52	3.17
100 gm / 3.70 cm	21,514	5.81E-07	963.55	0.32
10 gm / 1.72 cm	2,151	5.81E-08	96.36	0.03
1 gm / 7.96 mm	215	5.81E-09	9.64	0.00
0.1 gm / 3.70 mm	22	5.81E-10	0.96	0.00
0.01 gm / 1.72 mm	2	5.81E-11	0.10	0.00
0.001 gm / 0.80 mm	0	5.81E-12	0.01	0.00

Weight of pure Agardite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.78 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.48 % Th) From Sum REE Elements ( 9.58 % REE)

Agardite-(Ce) Classification

Dana Class:

42.5.1.2e (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.53-60 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-(Ce) Information

References:

NAME( AmMin 89:1574) PHYS. PROP.(AmMin 89:1574) OPTIC PROP.(AmMin 89:1574)

See Also:

Links to other databases for Agardite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Print or Cut-and-Paste your Agardite-(Ce) Specimen Label here :

Agardite-(Ce)

(Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O)
Dana No: 42.5.1.2e Strunz No: VII/D.53-60
Locality:

Notes: