Lermontovite Mineral Data
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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 % P2 O5
Hydrogen 0.82 % H 7.34 % H2 O
Oxygen 26.08 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
U(PO4 )(OH)•(H2 O)
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
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 - Dipyramidal H-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:
PELermontovite =1,709.40 barns/electronU=PELermontovite 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 Bequerols (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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Lermontovite
U++++(PO4)(OH)•(H2O) (?)
Dana No: 40.04.08.02 Strunz No: 08.DN.15
Locality:
Notes:
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