Meta-autunite Mineral Data

Meta-autunite Mineral Data

General Meta-autunite Information

Chemical Formula:

Ca(UO2)2(PO4)2·2-6(H2O)

Composition:

Molecular Weight = 842.14 gm

Calcium 4.76 % Ca 6.66 % CaO

Uranium 56.53 % U 64.13 % UO₂

Phosphorus 7.36 % P 16.86 % P₂O₅

Hydrogen 0.96 % H 8.56 % H₂O

Oxygen 30.40 % O

______ ______

100.00 % 96.20 % = TOTAL OXIDE

Empirical Formula:

Ca(UO₂)₂(PO₄)₂·4(H₂O)

Environment:

Associated with autunite in fractures in uraniferous igneous rocks.

IMA Status:

Valid Species (Pre-IMA) 1938

Locality:

Daybreak mine, Mt Spokane, Washington, USA Link to MinDat.org Location Data.

Name Origin:

Named as the lower hydrate of autunite.

Synonym:

Meta Autunite

Meta-autunite Image

Images:

Meta-autunite

Comments: Platy meta-autunite crystals fluorescing greenish yellow.
Location: Carretona, Spain. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Meta-autunite Autunite

Comments: Corner of a meta-autunite crystal showing the dehydration of autunite (dark green) to meta-autunite (lighter yellowish green)..
Location: Daybreak Mine, Spokane County, Washington, U.S.A.. Scale: See Image.
© Paul M. Schumacher

Meta-autunite Crystallography

Axial Ratios:

a:c = 1:1.2105

Cell Dimensions:

a = 6.988, c = 8.459, Z = 1; V = 413.07 Den(Calc)= 3.39

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.47(1), 3.61(0.85), 2.11(0.7),

Physical Properties of Meta-autunite

Color:

Yellow, Greenish yellow, Yellowish green.

Density:

3.45 - 3.55, Average = 3.5

Diaphaniety:

Translucent to Opaque

Hardness:

1 - Talc

Luster:

Pearly

Optical Properties of Meta-autunite

Gladstone-Dale:

CI meas= -0.237 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.277 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1763,KPDmeas= 0.1708,KC= 0.1381

Optical Data:

Uniaxial (-), e=1.584-1.596, w=1.604-1.607, bire=0.0110-0.0200.

Calculated Properties of Meta-autunite

Electron Density:

r_electron=3.08 gm/cc
note: r_{Meta-autunite}=3.50 gm/cc.

Fermion Index

Fermion Index = 0.00428
Boson Index = 0.99572

Photoelectric:

PE_{Meta-autunite}=1,460.61 barns/electron
U=PE_{Meta-autunite} x r_electron=4,492.13 barns/cc.

Radioactivity:

GRapi = 4,234,081.08 (Gamma Ray American Petroleum Institute Units)

Meta-autunite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 7.18 ± 1.80 grams of pure Meta-autunite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 718.38 ±179.59 grams of pure Meta-autunite .

**Estimated Radioactivity from Meta-autunite** - very strong
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 / 8.17 cm	101,188,181	2.73E-03	4,234,081.08	1,392.03
100 gm / 3.79 cm	10,118,818	2.73E-04	423,408.11	139.20
10 gm / 1.76 cm	1,011,882	2.73E-05	42,340.81	13.92
1 gm / 8.17 mm	101,188	2.73E-06	4,234.08	1.39
0.1 gm / 3.79 mm	10,119	2.73E-07	423.41	0.14
0.01 gm / 1.76 mm	1,012	2.73E-08	42.34	0.01
0.001 gm / 0.82 mm	101	2.73E-09	4.23	0.00

Weight of pure Meta-autunite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.50 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

Meta-autunite Classification

Dana Class:

40.2a.1.2 (40)Hydrated Phosphates, etc

(40.2a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++

(40.2a.1)Dana Group

40.2a.1.1 Autunite Ca(UO2)2(PO4)2·10-12(H2O) I 4/mmm 4/m 2/m 2/m

40.2a.1.2 Meta-autunite Ca(UO2)2(PO4)2·2-6(H2O) P 4/nmm 4/m 2/m 2/m

40.2a.1.3 Pseudo-autunite* (H3O)4Ca2(UO2)2(PO4)4·5(H2O)(?) Unk Ortho

40.2a.1.4 Sodium meta-autunite! Na2(UO2)2(PO4)2·6-8(H2O) P 4/nmm 4/m 2/m 2/m

Strunz Class:

VII/E.02-90 VII - Phosphates, Arsenates and Vanadates

VII/E - Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-

VII/E.02 - Meta-autunite group

VII/E.02-10 Metanovacekite Mg(UO2)2(AsO4)2·4-8(H2O) P 4/n 4/m

VII/E.02-20 Bassetite Fe(UO2)2(PO4)2·8(H2O) P 2₁/m 2/m

VII/E.02-30 Metakahlerite Fe(UO2)2(AsO4)2·8(H2O) P 4/mmm 4/m 2/m 2/m

VII/E.02-40 Lehnerite Mn[UO2/PO4]2·8(H2O) P 2₁/n 2/m

VII/E.02-50 Metakirchheimerite Co(UO2)2(AsO4)2·8(H2O) P 4/mmm 4/m 2/m 2/m

VII/E.02-60 Metatorbernite Cu(UO2)2(PO4)2·8(H2O) P 4/n 4/m

VII/E.02-70 Metazeunerite Cu(UO2)2(AsO4)2·8(H2O) P 4/n 4/m

VII/E.02-80 Metalodevite Zn(UO2)2(AsO4)2·10(H2O) P 4₁/m 4/m

VII/E.02-90 Meta-autunite Ca(UO2)2(PO4)2·2-6(H2O) P 4/nmm 4/m 2/m 2/m

VII/E.02-95 Sodium meta-autunite! Na2(UO2)2(PO4)2·6-8(H2O) P 4/nmm 4/m 2/m 2/m

VII/E.02-100 Meta-uranospinite Ca(UO2)2(AsO4)2·8(H2O) P 4/nmm 4/m 2/m 2/m

VII/E.02-110 Meta-uranocircite Ba(UO2)2(PO4)2·6-8(H2O) P 2₁ 2

VII/E.02-120 Metaheinrichite Ba(UO2)2(AsO4)2·8(H2O) P 4₁/? 4/m

VII/E.02-130 Sodium-uranospinite (Na2,Ca)(UO2)2(AsO4)2·5(H2O) P 4/nmm 4/m 2/m 2/m

VII/E.02-140 Meta-ankoleite K2(UO2)2(PO4)2·6(H2O) P 4/nmm 4/m 2/m 2/m

VII/E.02-150 Abernathyite K(UO2)(AsO4)·4(H2O) P 4/ncc 4/m 2/m 2/m

VII/E.02-160 Uramphite (NH4)(UO2)(PO4)·3(H2O) P 4/nmm 4/m 2/m 2/m

VII/E.02-170 Chernikovite (H3O)2(UO2)2(PO4)2·6(H2O) P 4/nmm 4/m 2/m 2/m

VII/E.02-180 Pseudo-autunite* (H3O)4Ca2(UO2)2(PO4)4·5(H2O)(?) Unk Ortho

VII/E.02-190 Ulrichite CaCu(UO2)(PO4)2·4(H2O) C 2/m 2/m

Other Meta-autunite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Meta-autunite Specimen Label here :

Meta-autunite

Ca(UO2)2(PO4)2·2-6(H2O)
Dana No: 40.2a.1.2 Strunz No: VII/E.02-90
Locality:

Notes: