Metakirchheimerite Mineral Data

General Metakirchheimerite Information

Chemical Formula:

Co(UO2)2(AsO4)2•8(H2O)

Composition:

Molecular Weight = 1,020.95 gm

Uranium 46.63 % U 52.90 % UO₂

Cobalt 5.77 % Co 8.12 % Co₂O₃

Arsenic 14.68 % As 22.51 % As₂O₅

Hydrogen 1.58 % H 14.12 % H₂O

Oxygen 31.34 % O

______ ______

100.00 % 97.65 % = TOTAL OXIDE

Empirical Formula:

Co(UO₂)₂(AsO₄)₂•8(H₂O)

Environment:

Secondary mineral formed in the oxidized zone of a U-As deposit.

IMA Status:

Valid Species (Pre-IMA) 1958

Locality:

Dump of the Sophia mine, near Wittichen, Black Forest, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for meta which indicates membership of this species in the meta-autunite group and for Franz Waldemar Kirchheimer (1911-), former Director of the Geological Survey of Baden-Wu rttemberg, Germany.

Name Pronunciation:

Metakirchheimerite + Pronunciation

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Metakirchheimerite Crystallography

Axial Ratios:

a:c = 1:1.19498

Cell Dimensions:

a = 7.18, c = 8.58, Z = 1; V = 442.32 Den(Calc)= 3.83

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): 3.56(1), 8.55(1), 5.07(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: CoUAs8

Physical Properties of Metakirchheimerite

Cleavage:

{001} Perfect

Color:

Light pink.

Density:

3.2 - 3.25, Average = 3.22

Diaphaneity:

Transparent to Translucent

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Pearly

Streak:

white

Optical Properties of Metakirchheimerite

Gladstone-Dale:

CI meas= -0.191 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1646,KPDmeas= 0.1955,KC= 0.1641
Ncalc = 1.53 - 1.63

Optical Data:

Uniaxial (-), e=1.617, w=1.644, bire=0.0270.

Calculated Properties of Metakirchheimerite

Electron Density:

Bulk Density (Electron Density)=3.40 gm/cc
note: Specific Gravity of Metakirchheimerite =3.83 gm/cc.

Fermion Index:

Fermion Index = 0.0035100956
Boson Index = 0.9964899044

Photoelectric:

PE_{Metakirchheimerite}=1,205.00 barns/electron
U=PE_{Metakirchheimerite} x r_electron=4,095.52 barns/cc.

Radioactivity:

GRapi = 3,527,063.82 (Gamma Ray American Petroleum Institute Units)
Concentration of Metakirchheimerite per GRapi unit = 283.52 (PPB)

Metakirchheimerite 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) 8.62 ± 2.16 grams of pure Metakirchheimerite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 862.38 ±215.59 grams of pure Metakirchheimerite .

**Estimated Radioactivity from Metakirchheimerite** - 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 / 7.93 cm	83,465,801	2.26E-03	3,527,063.82	1,159.58
100 gm / 3.68 cm	8,346,580	2.26E-04	352,706.38	115.96
10 gm / 1.71 cm	834,658	2.26E-05	35,270.64	11.60
1 gm / 7.93 mm	83,466	2.26E-06	3,527.06	1.16
0.1 gm / 3.68 mm	8,347	2.26E-07	352.71	0.12
0.01 gm / 1.71 mm	835	2.26E-08	35.27	0.01
0.001 gm / 0.79 mm	83	2.26E-09	3.53	0.00

Weight of pure Metakirchheimerite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.83 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

Metakirchheimerite Classification

Dana Class:

40.02a.17.01 (40)Hydrated Phosphates, etc

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

(40.02a.17)Dana Group

40.02a.17.01 Metakirchheimerite Co(UO2)2(AsO4)2•8(H2O) P 4/mmm 4/m 2/m 2/m

40.02a.17.02 Metarauchite! Ni(UO2)2(AsO4)2•8H2O P1 1

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 Metakirchheimerite 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 Metakirchheimerite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Metakirchheimerite

Co(UO2)2(AsO4)2•8(H2O)
Dana No: 40.02a.17.01 Strunz No: 08.EB.10
Locality:

Notes: