Agardite-(Ce) Mineral Data

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). Name Pronunciation: Agardite-(Ce) Synonym: ICSD 31255   IMA2003-030   PDF 75-1695  

Agardite-(Ce) Image

Images:

Agardite-(Ce) Comments: Green acicular to fibrous in spherical aggregates of agardite-(Ce) in a vug. Location: Hayashi, Setoda, Ikuchi Island, Hiroshima Prefecture, Chugoku Region, Honshu Island, Japan. Scale: See Image. © Rruff Database

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 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 Diaphaneity: 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
Ncalc = 1.68 - 1.69 Optical Data: Uniaxial (+), w=1.725, e=1.81, bire=0.0850.  

Calculated Properties of Agardite-(Ce)

Electron Density: Bulk Density (Electron Density)=3.56 gm/cc
note: Specific Gravity of Agardite-(Ce) =3.78 gm/cc.
Fermion Index: Fermion Index = 0.0095305374
Boson Index = 0.9904694626 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)
Concentration of Agardite-(Ce) per GRapi unit = 103.78 (PPM)

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 Becquerels (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: 42.05.01.02e (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-(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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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