Lermontovite Mineral Data

General Lermontovite Information

Chemical Formula:

U++++(PO4)(OH)•(H2O) (?)

Composition:

Molecular Weight = 368.02 gm

Uranium 64.68 % U 73.37 % UO₂

Phosphorus 8.42 % P 19.28 % P₂O₅

Hydrogen 0.82 % H 7.34 % H₂O

Oxygen 26.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

U(PO₄)(OH)•(H₂O)

Environment:

Uranium-bearing veins in a granite porphyry stock.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Beshtau uranium deposit, near Pyatigorsk, northern Caucasus Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Mikhail Yur’evich Lermontov (1814-1841), Russian poet.

Name Pronunciation:

Lermontovite + Pronunciation

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Lermontovite Crystallography

Axial Ratios:

a:b:c =0.5126:1:0.5315

Cell Dimensions:

a = 9.74, b = 19, c = 10.1, Z = 12; V = 1,869.11 Den(Calc)= 3.92

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C cca

Physical Properties of Lermontovite

Color:

Gray green.

Density:

4.5

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Luster:

Silky

Streak:

light green

Optical Properties of Lermontovite

Gladstone-Dale:

CI meas= -0.175 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.349 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1803,KPDmeas= 0.157,KC= 0.1336
Ncalc = 1.52 - 1.6

Optical Data:

Biaxial (?), a=1.686-1.69, b=1.707, g=1.724-1.726, bire=0.0360-0.0380

Calculated Properties of Lermontovite

Electron Density:

Bulk Density (Electron Density)=3.86 gm/cc
note: Specific Gravity of Lermontovite =4.50 gm/cc.

Fermion Index:

Fermion Index = 0.004783235
Boson Index = 0.995216765

Photoelectric:

PE_Lermontovite=1,709.40 barns/electron
U=PE_Lermontovite x r_electron=6,604.95 barns/cc.

Radioactivity:

GRapi = 4,733,701.49 (Gamma Ray American Petroleum Institute Units)
Concentration of Lermontovite per GRapi unit = 211.25 (PPB)

Lermontovite 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) 6.43 ± 1.61 grams of pure Lermontovite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 642.56 ±160.64 grams of pure Lermontovite .

**Estimated Radioactivity from Lermontovite** - 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 / 7.52 cm	115,773,163	3.13E-03	4,733,701.49	1,556.29
100 gm / 3.49 cm	11,577,316	3.13E-04	473,370.15	155.63
10 gm / 1.62 cm	1,157,732	3.13E-05	47,337.01	15.56
1 gm / 7.52 mm	115,773	3.13E-06	4,733.70	1.56
0.1 gm / 3.49 mm	11,577	3.13E-07	473.37	0.16
0.01 gm / 1.62 mm	1,158	3.13E-08	47.34	0.02
0.001 gm / 0.75 mm	116	3.13E-09	4.73	0.00

Weight of pure Lermontovite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.50 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

Lermontovite Classification

Dana Class:

40.04.08.02 (40)Hydrated Phosphates, etc

(40.04)where A+++ XO4 · x(H2O)

(40.04.08)Ningyoite Group

40.04.08.01 Ningyoite (U,Ca,Ce)2(PO4)2•1-2(H2O) P 222 2 2 2

40.04.08.02 Lermontovite U(PO4)(OH)•(H2O)(?) C cca 2/m 2/m 2/m

40.04.08.03 Vyacheslavite U(PO4)(OH)•2.5(H2O) C mcm, C mc2₁, C 2cm Ortho

Strunz Class:

08.DN.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DN -With only large cations

08.DN.15 Lermontovite U(PO4)(OH)•(H2O)(?) C cca 2/m 2/m 2/m

Other Lermontovite 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 Lermontovite :
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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Print or Cut-and-Paste your Lermontovite Specimen Label here :

Lermontovite

U++++(PO4)(OH)•(H2O) (?)
Dana No: 40.04.08.02 Strunz No: 08.DN.15
Locality:

Notes: