Metakirchheimerite Mineral Data

Metakirchheimerite Mineral Data +

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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)

IMA Status:

Valid Species (Pre-IMA) 1958

Locality:

Link to MinDat.org Location Data.

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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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Metakirchheimerite

Electron Density:

r_electron=3.40 gm/cc
note: r_{Metakirchheimerite}=3.83 gm/cc.

Fermion Index

Fermion Index = 0.00351
Boson Index = 0.99649

Photoelectric:

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

Radioactivity:

GRapi = 3,527,062.36 (Gamma Ray American Petroleum Institute Units)

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 Bequerols (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	83,465,785	2.26E-03	3,527,062.36	1,159.58
100 gm / 3.68 cm	8,346,579	2.26E-04	352,706.24	115.96
10 gm / 1.71 cm	834,658	2.26E-05	35,270.62	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:

40.2a.17.1 (40)Hydrated Phosphates, etc

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

(40.2a.17)Dana Group

40.2a.17.1 Metakirchheimerite Co(UO2)2(AsO4)2·8(H2O) P 4/mmm 4/m 2/m 2/m

Strunz Class:

VII/E.02-50 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 Metakirchheimerite 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 Metakirchheimerite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Metakirchheimerite

Co(UO2)2(AsO4)2·8(H2O)
Dana No: 40.2a.17.1 Strunz No: VII/E.02-50
Locality:

Notes: