Agardite-(Nd) Mineral Data

General Agardite-(Nd) Information

Chemical Formula:

(Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6•3(H2O)

Composition:

Molecular Weight = 1,063.17 gm

Calcium 0.38 % Ca 0.53 % CaO

Lanthanum 1.31 % La 1.53 % La₂O₃

Yttrium 0.84 % Y 1.06 % Y₂O₃

Copper 34.07 % Cu 42.65 % CuO

Arsenic 21.14 % As 32.43 % As₂O₅

Hydrogen 1.36 % H 12.12 % H₂O

Lead 5.85 % Pb 6.30 % PbO

Neodymium 2.71 % Nd 3.16 % Nd₂O₃

Oxygen 32.35 % O

______ ______

100.00 % 99.77 % = TOTAL OXIDE

Empirical Formula:

Pb_0.3Nd_0.2Y_0.1La_0.1Ca_0.1Cu_5.7(AsO₄)₃(OH)_4.7ï¿½4.8(H₂O)

IMA Status:

Not Approved IMA (Dana # Added)

Locality:

Wittichen, Black Forest, Baden-Wï¿½rttemberg, Germany. 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-(Nd)

Agardite-(Nd) Image

Images:

Agardite-(Nd)

Comments: Bluish-green agardite-(Nd) crystals and green conichalcite botroids.
Location: Big Three Mine, Esmeralda County, Nevada, USA. Scale: Specimen Length 4 cm.
© Adam Larson

Agardite-(Nd) Crystallography

Crystal System:

Hexagonal - Dipyramidal H-M Symbol (6/m)

Physical Properties of Agardite-(Nd)

Color:

Grass green, Sky blue.

Density:

3.72

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

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

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

greenish white

Optical Properties of Agardite-(Nd)

Optical Data:

NCalc= 1.68 - from Gladstone-Dale relationship (KC = 0.1841) where Ncalc=Dmeas*KC+1

Calculated Properties of Agardite-(Nd)

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Agardite-(Nd) =3.72 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Agardite-(Nd)}= 147.80 barns/electron
U=PE_{Agardite-(Nd)} x r_electron= 515.92 barns/cc.

Radioactivity:

GRapi = 4,023.43 (Gamma Ray American Petroleum Institute Units)
Concentration of Agardite-(Nd) per GRapi unit = 248.54 (PPM)

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

**Estimated Radioactivity from Agardite-(Nd)** - 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 / 8.01 cm	90,046	2.43E-06	4,023.43	1.32
100 gm / 3.72 cm	9,005	2.43E-07	402.34	0.13
10 gm / 1.73 cm	900	2.43E-08	40.23	0.01
1 gm / 8.01 mm	90	2.43E-09	4.02	0.00
0.1 gm / 3.72 mm	9	2.43E-10	0.40	0.00
0.01 gm / 1.73 mm	1	2.43E-11	0.04	0.00
0.001 gm / 0.80 mm	0	2.43E-12	0.00	0.00

Weight of pure Agardite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.72 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)

Agardite-(Nd) Classification

Dana Class:

42.05.01.02b (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-(Nd) Information

References:

NAME( Dana8) PHYS. PROP.(AmMin, Vol 88, p 475)

See Also:

Links to other databases for Agardite-(Nd) :
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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Print or Cut-and-Paste your Agardite-(Nd) Specimen Label here :

Agardite-(Nd)

(Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6•3(H2O)
Dana No: 42.05.01.02b Strunz No: 08.DL.15
Locality:

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