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),

Crystal Structure:

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Makarov E S , Ivanov V I , Doklady Akademii Nauk SSSR , 132 (1960) p.601-603, The crystal structure of meta-autunite, Ca(UO2)2(PO4)2*6H2O

Physical Properties of Meta-autunite

Color:

Yellow, Greenish yellow, Yellowish green.

Density:

3.45 - 3.55, Average = 3.5

Diaphaneity:

Translucent to Opaque

Hardness:

1 - Talc

Luminescence:

Fluorescent, Short UV=pale yellow green, Long UV=pale yellow green.

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
Ncalc = 1.47 - 1.49

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:

Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Meta-autunite =3.50 gm/cc.

Fermion Index:

Fermion Index = 0.0042817325
Boson Index = 0.9957182675

Photoelectric:

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

Radioactivity:

GRapi = 4,234,083.25 (Gamma Ray American Petroleum Institute Units)
Concentration of Meta-autunite per GRapi unit = 236.18 (PPB)

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 Becquerels (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	101,188,193	2.73E-03	4,234,083.25	1,392.03
100 gm / 3.79 cm	10,118,819	2.73E-04	423,408.33	139.20
10 gm / 1.76 cm	1,011,882	2.73E-05	42,340.83	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:

40.02a.01.02 (40)Hydrated Phosphates, etc

(40.02a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++

(40.02a.01)Autunite Group

40.02a.01.01 Autunite Ca(UO2)2(PO4)2•10-12(H2O) I 4/mmm 4/m 2/m 2/m

40.02a.01.02 Meta-autunite Ca(UO2)2(PO4)2•2-6(H2O) P 4/nmm 4/m 2/m 2/m

40.02a.01.03 Pseudo-autunite* (H3O)4Ca2(UO2)2(PO4)4•5(H2O)(?) Unk Ortho

40.02a.01.04 Sodium meta-autunite! Na2(UO2)2(PO4)2•6-8(H2O) P 4/nmm 4/m 2/m 2/m

Strunz Class:

08.EB.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EB -UO2:RO4 = 1:1

08.EB.10 Bassetite Fe(UO2)2(PO4)2•8(H2O) P 2₁/m 2/m

08.EB.10 Lehnerite Mn[UO2/PO4]2•8(H2O) P 2₁/n 2/m

08.EB.10 Metazeunerite Cu(UO2)2(AsO4)2•8(H2O) P 4/n 4/m

08.EB.10 Meta-autunite Ca(UO2)2(PO4)2•2-6(H2O) P 4/nmm 4/m 2/m 2/m

08.EB.10 Metauranocircite Ba(UO2)2(PO4)2•6-8(H2O) P 2₁ 2

08.EB.10 Metauranospinite Ca(UO2)2(AsO4)2•8(H2O) P 4/nmm 4/m 2/m 2/m

08.EB.10 Metaheinrichite Ba(UO2)2(AsO4)2•8(H2O) P 2₁ 2

08.EB.10 Metakahlerite Fe(UO2)2(AsO4)2•8(H2O) P 4/mmm 4/m 2/m 2/m

08.EB.10 Metakirchheimerite Co(UO2)2(AsO4)2•8(H2O) P 4/mmm 4/m 2/m 2/m

08.EB.10 Metalodevite Zn(UO2)2(AsO4)2•10(H2O) P 4₁/m 4/m

08.EB.10 Metanovacekite Mg(UO2)2(AsO4)2•4-8(H2O) P 4/n 4/m

08.EB.10 Metatorbernite Cu(UO2)2(PO4)2•8(H2O) P 4/n 4/m

08.EB.10 Przhevalskite Pb(UO2)2(PO4)2•4(H2O) Unk Tetra

Other Meta-autunite Information

References:

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

See Also:

Links to other databases for Meta-autunite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - Uranium Minerals
15 - WWW-MINCRYST

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Ask about Meta-autunite here :
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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: 40.02a.01.02 Strunz No: 08.EB.10
Locality:

Notes: