Lehnerite Mineral Data

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)

Environment:

Secondary mineral in the oxidized zone of a complex granite pegmatite.

IMA Status:

Approved IMA 1988

Locality:

Hagendorf, Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Ferdinand Lehner (1868-1943), Pleystein, Germany, an early collector of Hagendorf minerals.

Name Pronunciation:

Lehnerite + Pronunciation

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 - Prismatic H-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

Diaphaneity:

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
Ncalc = 1.58 - 1.6

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:

Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Lehnerite =3.67 gm/cc.

Fermion Index:

Fermion Index = 0.0038572703
Boson Index = 0.9961427297

Photoelectric:

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

Radioactivity:

GRapi = 3,901,983.91 (Gamma Ray American Petroleum Institute Units)
Concentration of Lehnerite per GRapi unit = 256.28 (PPB)

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	3,901,983.91	1,282.84
100 gm / 3.73 cm	9,172,119	2.48E-04	390,198.39	128.28
10 gm / 1.73 cm	917,212	2.48E-05	39,019.84	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:

40.02a.16.02 (40)Hydrated Phosphates, etc

(40.02a)where A++ (B++)2 (XO4) ï¿½ x(H2O), containing (UO2)++

(40.02a.16)Dana Group

40.02a.16.01 Bassetite Fe(UO2)2(PO4)2•8(H2O) P 2₁/m 2/m

40.02a.16.02 Lehnerite Mn[UO2/PO4]2•8(H2O) P 2₁/n 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 Lehnerite Information

References:

NAME( AntBidBlaNic4) 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 - 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
15 - Uranium Minerals

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Lehnerite

Mn[UO2/PO4]2•8(H2O)
Dana No: 40.02a.16.02 Strunz No: 08.EB.10
Locality:

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