Agardite-(La) Mineral Data

General Agardite-(La) Information

Chemical Formula:

(La,Ca)Cu6(AsO4)3(OH)6•3(H2O)

Composition:

Molecular Weight = 1,068.32 gm

Calcium 0.94 % Ca 1.31 % CaO

Lanthanum 9.75 % La 11.44 % La₂O₃

Copper 35.69 % Cu 44.67 % CuO

Arsenic 21.04 % As 32.27 % As₂O₅

Hydrogen 1.13 % H 10.12 % H₂O

Oxygen 31.45 % O

______ ______

100.00 % 99.81 % = TOTAL OXIDE

Empirical Formula:

La_0.75Ca_0.25Cu₆(AsO₄)₃(OH)₆•3(H₂O)

IMA Status:

Approved IMA 1985 (Dana # Added)

Locality:

USA, NM, Lincoln Co, Red Cloud mn 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-(La)

Agardite-(La) Image

Images:

Agardite-(La)

Comments: Blue-green acicular sprays of agardite-(La) in a gossanous matrix.
Location: Laurion, Greece. Scale: Specimen Size 4 cm.
© Adam Larson

Agardite-(La) Crystallography

Axial Ratios:

a:c = 1:0.43491

Cell Dimensions:

a = 13.605, c = 5.917, Z = 2; V = 948.48 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): 11.7(1)(100), 2.45(0.4)(122), 3.56(0.27)(121),4.45(0.17)(120), 2.94(0.15)(400),

Physical Properties of Agardite-(La)

Color:

Colorless, Yellowish green, Blue.

Density:

3.72

Diaphaneity:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

greenish white

Optical Properties of Agardite-(La)

Optical Data:

NCalc= 1.68 - from Gladstone-Dale relationship (KC = 0.1823) where Ncalc=Dcalc*KC+1
NCalc= 1.68 - from Gladstone-Dale relationship (KC = 0.1823) where Ncalc=Dmeas*KC+1

Calculated Properties of Agardite-(La)

Electron Density:

Bulk Density (Electron Density)=3.51 gm/cc
note: Specific Gravity of Agardite-(La) =3.74 gm/cc.

Fermion Index:

Fermion Index = 0.0002530845
Boson Index = 0.9997469155

Photoelectric:

PE_{Agardite-(La)}= 75.43 barns/electron
U=PE_{Agardite-(La)} x r_electron= 264.47 barns/cc.

Radioactivity:

GRapi = 9,751.15 (Gamma Ray American Petroleum Institute Units)
Concentration of Agardite-(La) per GRapi unit = 102.55 (PPM)

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

**Estimated Radioactivity from Agardite-(La)** - 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	218,437	5.90E-06	9,751.15	3.21
100 gm / 3.71 cm	21,844	5.90E-07	975.11	0.32
10 gm / 1.72 cm	2,184	5.90E-08	97.51	0.03
1 gm / 7.99 mm	218	5.90E-09	9.75	0.00
0.1 gm / 3.71 mm	22	5.90E-10	0.98	0.00
0.01 gm / 1.72 mm	2	5.90E-11	0.10	0.00
0.001 gm / 0.80 mm	0	5.90E-12	0.01	0.00

Weight of pure Agardite-(La) 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 ( 0.49 % Th) From Sum REE Elements ( 9.75 % REE)

Agardite-(La) Classification

Dana Class:

42.05.01.02a (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-(La) Information

References:

NAME( Dana8) PHYS. PROP.(Dana, MinCryst)

See Also:

Links to other databases for Agardite-(La) :
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-(La) Specimen Label here :

Agardite-(La)

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

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