Mineralogy Database

Meta-autunite Mineral Data

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General Meta-autunite Information

Help on Chemical  Formula: Chemical Formula: Ca(UO2)2(PO4)2•2-6(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca(UO2)2(PO4)2•4(H2O)
Help on Environment: Environment: Associated with autunite in fractures in uraniferous igneous rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1938
Help on Locality: Locality: Daybreak mine, Mt Spokane, Washington, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the lower hydrate of autunite.
Help on Synonym: Synonym: Meta Autunite
 

Meta-autunite Image

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  Meta-autunite

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

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  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

Help on Axial Ratios: Axial Ratios: a:c = 1:1.2105
Help on Cell Dimensions: Cell Dimensions: a = 6.988, c = 8.459, Z = 1; V = 413.07 Den(Calc)= 3.39
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.47(1), 3.61(0.85), 2.11(0.7),
 

Physical Properties of Meta-autunite

Help on Color: Color: Yellow, Greenish yellow, Yellowish green.
Help on Density: Density: 3.45 - 3.55, Average = 3.5
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Hardness: Hardness: 1 - Talc
Help on Luminescence: Luminescence: Fluorescent, Short UV=pale yellow green, Long UV=pale yellow green.
Help on Luster: Luster: Pearly
 

Optical Properties of Meta-autunite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.584-1.596, w=1.604-1.607, bire=0.0110-0.0200.
 

Calculated Properties of Meta-autunite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.08 gm/cc
note: Specific Gravity of Meta-autunite =3.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0042817325
Boson Index = 0.9957182675
Help on Photoelectric: Photoelectric: PEMeta-autunite =1,460.61 barns/electron
U=PEMeta-autunite x relectron=4,492.13 barns/cc.
Help on Radioactivity: 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
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 101,188,193 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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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:

 

 
   
 


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