Metakahlerite Mineral Data

Metakahlerite Mineral Data +

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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)

IMA Status:

Approved IMA 1964

Locality:

Link to MinDat.org Location Data.

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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 DipyramidalH-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),

Crystal Structure:

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Locock A J , Burns P C , Flynn M , The Canadian Mineralogist , 42 (2004) p.1699-1718, Divalent transition metals and magnesium in structures, that contain the autunite-type sheet, Sample: FeUAs8

Physical Properties of Metakahlerite

Cleavage:

[001] Perfect, [100] Good

Color:

Sulfur yellow.

Density:

3.48

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Metakahlerite

Electron Density:

r_electron=3.39 gm/cc
note: r_{Metakahlerite}=3.82 gm/cc.

Fermion Index

Fermion Index = 0.00468
Boson Index = 0.99532

Photoelectric:

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

Radioactivity:

GRapi = 3,540,649.83 (Gamma Ray American Petroleum Institute Units)

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	83,718,855	2.26E-03	3,540,649.83	1,164.05
100 gm / 3.68 cm	8,371,886	2.26E-04	354,064.98	116.40
10 gm / 1.71 cm	837,189	2.26E-05	35,406.50	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	354.06	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:

40.2a.15.2 (40)Hydrated Phosphates, etc

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

(40.2a.15)Dana Group

40.2a.15.1 Kahlerite Fe(UO2)2(AsO4)2·10-12(H2O) P 4₁/n 4/m

40.2a.15.2 Metakahlerite Fe(UO2)2(AsO4)2·8(H2O) P 4/mmm 4/m 2/m 2/m

Strunz Class:

VII/E.02-30 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 Metakahlerite Information

References:

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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Metakahlerite

Fe++(UO2)2(AsO4)2·8(H2O)
Dana No: 40.2a.15.2 Strunz No: VII/E.02-30
Locality:

Notes: