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Lermontovite Mineral Data

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General Lermontovite Information

Help on Chemical  Formula: Chemical Formula: U++++(PO4)(OH)•(H2O) (?)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: U(PO4)(OH)•(H2O)
Help on Environment: Environment: Uranium-bearing veins in a granite porphyry stock.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1955
Help on Locality: Locality: Beshtau uranium deposit, near Pyatigorsk, northern Caucasus Mountains, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Mikhail Yur�evich Lermontov (1814-1841), Russian poet.
Help on Name Pronunciation: Name Pronunciation: Lermontovite + Pronunciation Say LERMONTOVITE
 

Lermontovite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5126:1:0.5315
Help on Cell Dimensions: Cell Dimensions: a = 9.74, b = 19, c = 10.1, Z = 12; V = 1,869.11 Den(Calc)= 3.92
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C cca
 

Physical Properties of Lermontovite

Help on Color: Color: Gray green.
Help on Density: Density: 4.5
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Luster: Luster: Silky
Help on Streak: Streak: light green
 

Optical Properties of Lermontovite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.86 gm/cc
note: Specific Gravity of Lermontovite =4.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.004783235
Boson Index = 0.995216765
Help on Photoelectric: Photoelectric: PELermontovite =1,709.40 barns/electron
U=PELermontovite x relectron=6,604.95 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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:

 

 
   
 


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