Metakahlerite Mineral Data

General Metakahlerite Information

Chemical Formula:

Fe++(UO2)2(AsO4)2•8(H2O)

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

Empirical Formula:

Fe²⁺(UO₂)₂(AsO₄)₂•8(H₂O)

Environment:

Secondary mineral in the oxidized zone of Uï¿½As bearing deposits.

IMA Status:

Approved IMA 1964

Locality:

Sophia mine, Germany. Link to MinDat.org Location Data.

Name Origin:

Named by adding the prefix meta which indicates the dehydration product of kahlerite.

Name Pronunciation:

Metakahlerite + Pronunciation

Metakahlerite Crystallography

Axial Ratios:

a:c = 1:1.19498

Cell Dimensions:

a = 7.18, c = 8.58, Z = 1; V = 442.32 Den(Calc)= 3.82

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/I_o): 3.59(1), 8.55(0.9), 4.29(0.6),

Physical Properties of Metakahlerite

Cleavage:

{001} Perfect, {100} Good

Color:

Sulfur yellow.

Density:

3.48

Diaphaneity:

Transparent to Translucent

Hardness:

2.5 - Finger Nail

Luster:

Pearly

Streak:

light yellow

Optical Properties of Metakahlerite

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

Optical Data:

Uniaxial (-), e=1.608, w=1.642, bire=0.0340.

Calculated Properties of Metakahlerite

Electron Density:

Bulk Density (Electron Density)=3.39 gm/cc
note: Specific Gravity of Metakahlerite =3.82 gm/cc.

Fermion Index:

Fermion Index = 0.0046839169
Boson Index = 0.9953160831

Photoelectric:

PE_{Metakahlerite}=1,207.32 barns/electron
U=PE_{Metakahlerite} x r_electron=4,096.06 barns/cc.

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

Dana Class:

40.02a.15.02 (40)Hydrated Phosphates, etc

(40.02a)where A++ (B++)2 (XO4) ï¿½ 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

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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Metakahlerite

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

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