Plumboagardite Mineral Data

General Plumboagardite Information

Chemical Formula:

(Pb,REE,Ca)Cu6(AsO4)3(OH)6•3(H2O)

Composition:

Molecular Weight = 1,097.39 gm

Calcium 1.02 % Ca 1.43 % CaO

Lanthanum 1.65 % La 1.93 % La₂O₃

Cerium 0.77 % Ce 0.90 % Ce₂O₃

Praeseodymium 0.13 % Pr 0.15 % Pr₂O₃

Samarium 0.14 % Sm 0.16 % Sm₂O₃

Gadolinium 0.14 % Gd 0.17 % Gd₂O₃

Dysprosium 0.15 % Dy 0.17 % Dy₂O₃

Yttrium 0.73 % Y 0.93 % Y₂O₃

Iron 1.07 % Fe 1.53 % Fe₂O₃

Copper 32.37 % Cu 40.52 % CuO

Silicon 0.69 % Si 1.48 % SiO₂

Arsenic 19.39 % As 29.74 % As₂O₅

Phosphorus 0.14 % P 0.32 % P₂O₅

Hydrogen 1.16 % H 10.39 % H₂O

Lead 8.31 % Pb 8.95 % PbO

Neodymium 1.05 % Nd 1.23 % Nd₂O₃

Oxygen 31.10 % O

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

Pb_0.44La_0.13Nd_0.08Ce_0.06Pr_0.01Sm_0.01Gd_0.01Dy_0.01Y_0.09Ca_0.28Cu_5.59Fe³⁺_0.21As_2.84Si_0.27 P_0.05O₁₂(OH)₆ï¿½3.33(H₂O)

Environment:

Formed in an oxidized zone, the product of alteration of primary Pb, Cu, REE, and As minerals such as chalcopyrite, fluorite, fahlore, and galena. Mixite group.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Found in an abandoned mine, Aitern-Sï¿½d, near Schï¿½nau in the Southern Black Forest, Germany. Link to MinDat.org Location Data.

Name Origin:

Named as Pb (plumbo) analogue of agardite.

Synonym:

IMA2003-031a

Plumboagardite Crystallography

Axial Ratios:

a:c = 1:0.43137

Cell Dimensions:

a = 13.77, c = 5.94, Z = 2; V = 975.41 Den(Calc)= 3.74

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): 12.01(1), 3.6(0.8), 2.49(0.7),2.98(0.6), 4.51(0.6), 1.817(0.5), 2.61(0.5), 2.74(0.5), 3.31(0.5),

Physical Properties of Plumboagardite

Cleavage:

None

Color:

Grass green.

Diaphaneity:

Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

greenish

Optical Properties of Plumboagardite

Gladstone-Dale:

CI calc= -0.112 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2047,KC= 0.184
Ncalc = 1.69

Optical Data:

Uniaxial (+), w=1.726, e=1.805, bire=0.0790.

Calculated Properties of Plumboagardite

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Plumboagardite =3.74 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Plumboagardite}= 186.95 barns/electron
U=PE_{Plumboagardite} x r_electron= 653.09 barns/cc.

Radioactivity:

GRapi = 4,012.86 (Gamma Ray American Petroleum Institute Units)
Concentration of Plumboagardite per GRapi unit = 249.20 (PPM)

Plumboagardite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Plumboagardite** - 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 / 7.99 cm	90,220	2.44E-06	4,012.86	1.32
100 gm / 3.71 cm	9,022	2.44E-07	401.29	0.13
10 gm / 1.72 cm	902	2.44E-08	40.13	0.01
1 gm / 7.99 mm	90	2.44E-09	4.01	0.00
0.1 gm / 3.71 mm	9	2.44E-10	0.40	0.00
0.01 gm / 1.72 mm	1	2.44E-11	0.04	0.00
0.001 gm / 0.80 mm	0	2.44E-12	0.00	0.00

Weight of pure Plumboagardite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.74 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 ( 0.20 % Th) From Sum REE Elements ( 4.02 % REE)

Plumboagardite Classification

Dana Class:

42.05.01.06 (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 Plumboagardite Information

References:

NAME( AmMin, v91, p713) PHYS. PROP.(AmMin, v91, p713) OPTIC PROP.(AmMin, v91, p713)

See Also:

Links to other databases for Plumboagardite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Plumboagardite

(Pb,REE,Ca)Cu6(AsO4)3(OH)6•3(H2O)
Dana No: 42.05.01.06 Strunz No: 08.DL.15
Locality:

Notes:

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