Lehnerite Mineral Data

Lehnerite Mineral Data +

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General Lehnerite Information

Chemical Formula:

Mn[UO2/PO4]2·8(H2O)

Composition:

Molecular Weight = 929.06 gm

Uranium 51.24 % U 58.13 % UO₂

Manganese 5.91 % Mn 8.50 % Mn₂O₃

Phosphorus 6.67 % P 15.28 % P₂O₅

Hydrogen 1.74 % H 15.51 % H₂O

Oxygen 34.44 % O

______ ______

100.00 % 97.42 % = TOTAL OXIDE

Empirical Formula:

Mn³⁺(UO₂)₂(PO₄)₂·8(H₂O)

IMA Status:

Approved IMA 1988

Locality:

Link to MinDat.org Location Data.

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Lehnerite Crystallography

Axial Ratios:

a:b:c =0.4102:1:0.405

Cell Dimensions:

a = 7.04, b = 17.16, c = 6.95, Z = 2; beta = 90.18° V = 839.60 Den(Calc)= 3.67

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.56(1), 3.5(0.8), 2.23(0.7),

Physical Properties of Lehnerite

Cleavage:

[???] Perfect

Color:

Bronze, Honey yellow.

Density:

3.5 - 3.6, Average = 3.55

Diaphaniety:

Transparent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Lehnerite

Gladstone-Dale:

CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1647,KPDmeas= 0.1702,KC= 0.1644

Optical Data:

Biaxial (-), a=1.599, b=1.607, g=1.607, bire=0.0080, 2V(Calc)=0, 2V(Meas)=45.

Calculated Properties of Lehnerite

Electron Density:

r_electron=3.28 gm/cc
note: r_Lehnerite=3.67 gm/cc.

Fermion Index

Fermion Index = 0.00385
Boson Index = 0.99615

Photoelectric:

PE_Lehnerite=1,303.31 barns/electron
U=PE_Lehnerite x r_electron=4,273.16 barns/cc.

Radioactivity:

GRapi = 3,901,982.72 (Gamma Ray American Petroleum Institute Units)

Lehnerite 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) 7.80 ± 1.95 grams of pure Lehnerite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 779.52 ±194.88 grams of pure Lehnerite .

**Estimated Radioactivity from Lehnerite** - 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 / 8.04 cm	91,721,193	2.48E-03	3,901,982.72	1,282.84
100 gm / 3.73 cm	9,172,119	2.48E-04	390,198.27	128.28
10 gm / 1.73 cm	917,212	2.48E-05	39,019.83	12.83
1 gm / 8.04 mm	91,721	2.48E-06	3,901.98	1.28
0.1 gm / 3.73 mm	9,172	2.48E-07	390.20	0.13
0.01 gm / 1.73 mm	917	2.48E-08	39.02	0.01
0.001 gm / 0.80 mm	92	2.48E-09	3.90	0.00

Weight of pure Lehnerite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.67 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

Lehnerite Classification

Dana Class:

40.2a.16.2 (40)Hydrated Phosphates, etc

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

(40.2a.16)Dana Group

40.2a.16.1 Bassetite Fe(UO2)2(PO4)2·8(H2O) P 2₁/m 2/m

40.2a.16.2 Lehnerite Mn[UO2/PO4]2·8(H2O) P 2₁/n 2/m

Strunz Class:

VII/E.02-40 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 Lehnerite Information

References:

PHYS. PROP.(Am.Min.,Vol.75,p1433,1990) OPTIC PROP.(Am.Min.,Vol.75,p1433,1990)

See Also:

Links to other databases for Lehnerite :
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 - Uranium Minerals 13 -École des Mines de Paris

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Lehnerite

Mn[UO2/PO4]2·8(H2O)
Dana No: 40.2a.16.2 Strunz No: VII/E.02-40
Locality:

Notes: