Mineralogy Database

Metakahlerite Mineral Data

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General Metakahlerite Information

Help on Chemical  Formula: Chemical Formula: Fe++(UO2)2(AsO4)2•8(H2O)
Help on Composition: Composition: Molecular Weight = 1,017.86 gm
   Uranium   46.77 %  U    53.06 % UO2
   Iron       5.49 %  Fe    7.06 % FeO
   Arsenic   14.72 %  As   22.58 % As2O5
   Hydrogen   1.58 %  H    14.16 % H2O
   Oxygen    31.44 %  O
            ______        ______ 
            100.00 %       96.86 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+(UO2)2(AsO4)2•8(H2O)
Help on Environment: Environment: Secondary mineral in the oxidized zone of U�As bearing deposits.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Sophia mine, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named by adding the prefix meta which indicates the dehydration product of kahlerite.
Help on Name Pronunciation: Name Pronunciation: Metakahlerite + Pronunciation Say METAKAHLERITE
 

Metakahlerite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.19498
Help on Cell Dimensions: Cell Dimensions: a = 7.18, c = 8.58, Z = 1; V = 442.32 Den(Calc)= 3.82
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.59(1), 8.55(0.9), 4.29(0.6),
 

Physical Properties of Metakahlerite

Help on Cleavage: Cleavage: {001} Perfect, {100} Good
Help on Color: Color: Sulfur yellow.
Help on Density: Density: 3.48
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Pearly
Help on Streak: Streak: light yellow
 

Optical Properties of Metakahlerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.189 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.083 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1636,KPDmeas= 0.1796,KC= 0.1511
Ncalc = 1.53 - 1.58
Help on Optical Data: Optical Data: Uniaxial (-), e=1.608, w=1.642, bire=0.0340.
 

Calculated Properties of Metakahlerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.39 gm/cc
note: Specific Gravity of Metakahlerite =3.82 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0046839169
Boson Index = 0.9953160831
Help on Photoelectric: Photoelectric: PEMetakahlerite =1,207.32 barns/electron
U=PEMetakahlerite x relectron=4,096.06 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,540,651.36 (Gamma Ray American Petroleum Institute Units)
Concentration of Metakahlerite per GRapi unit = 282.43 (PPB)

Metakahlerite 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) 8.59 ± 2.15 grams of pure Metakahlerite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 859.07 ±214.77 grams of pure Metakahlerite .

Estimated Radioactivity from Metakahlerite - 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 / 7.94 cm 83,718,873 2.26E-03 3,540,651.36 1,164.05
100 gm / 3.68 cm 8,371,887 2.26E-04 354,065.14 116.40
10 gm / 1.71 cm 837,189 2.26E-05 35,406.51 11.64
1 gm / 7.94 mm 83,719 2.26E-06 3,540.65 1.16
0.1 gm / 3.68 mm 8,372 2.26E-07 354.07 0.12
0.01 gm / 1.71 mm 837 2.26E-08 35.41 0.01
0.001 gm / 0.79 mm 84 2.26E-09 3.54 0.00

Weight of pure Metakahlerite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.82 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
 

Metakahlerite Classification

Help on  Dana Class: Dana Class: 40.02a.15.02 (40)Hydrated Phosphates, etc
  (40.02a)where A++ (B++)2 (XO4) � x(H2O), containing (UO2)++
  (40.02a.15)Dana Group
 
40.02a.15.01 Kahlerite Fe(UO2)2(AsO4)2•10-12(H2O) P 41/n 4/m
 
40.02a.15.02 Metakahlerite Fe(UO2)2(AsO4)2•8(H2O) P 4/mmm 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 Metakahlerite Information

Help on References: References: NAME( AntBidBlaNic4) 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 Metakahlerite :
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 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Print or Cut-and-Paste your Metakahlerite Specimen Label here :

Metakahlerite

Fe++(UO2)2(AsO4)2•8(H2O)
Dana No: 40.02a.15.02 Strunz No: 08.EB.10
Locality:

 

Notes:

 

 
   
 


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