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Tornebohmite-(La) Mineral Data

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General Tornebohmite-(La) Information

Help on Chemical  Formula: Chemical Formula: (La,Ce)2Al(SiO4)2(OH)
Help on Composition: Composition: Molecular Weight = 506.57 gm
   Lanthanum  41.13 %  La   48.24 % La2O3
   Cerium     13.83 %  Ce   16.20 % Ce2O3
   Aluminum    5.33 %  Al   10.06 % Al2O3
   Silicon    11.09 %  Si   23.72 % SiO2
   Hydrogen    0.20 %  H     1.78 % H2O
   Oxygen     28.43 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: La1.5Ce0.5Al(SiO4)2(OH)
Help on Environment: Environment: Rare-earth ore deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1921
Help on Locality: Locality: Bastnas mine, Riddarhyttan, Vastmanland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alfred Ellis Tornebohm (1839-1911), former director of the Geological Survey of Sweden.
Help on Name Pronunciation: Name Pronunciation: Tornebohmite-(La) + Pronunciation Say TORNEBOHMITE-(LA)
 

Tornebohmite-(La) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3014:1:2.9855
Help on Cell Dimensions: Cell Dimensions: a = 7.383, b = 5.673, c = 16.937, Z = 4; beta = 112.04° V = 657.54 Den(Calc)= 5.12
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.09(1), 2.82(0.7), 4.6(0.7),2.63(0.6), 2.18(0.4), 2.84(0.4), 3.48(0.4), 2(0.2),
 

Physical Properties of Tornebohmite-(La)

Help on Color: Color: Green, Bright olive green.
Help on Density: Density: 4.94
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Adamantine - Greasy
 

Optical Properties of Tornebohmite-(La)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.16,KPDmeas= 0.1659,KC= 0.1709
Ncalc = 1.84 - 1.88
Help on Optical Data: Optical Data: Biaxial (+), a=1.808, b=1.812, g=1.838, bire=0.0300
Help on Pleochroism (x): Pleochroism (x): pink or greenish yellow.
Help on Pleochroism (y): Pleochroism (y): bluish green or bluish green.
Help on Pleochroism (z): Pleochroism (z): pink or pink.
 

Calculated Properties of Tornebohmite-(La)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.46 gm/cc
note: Specific Gravity of Tornebohmite-(La) =4.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.00568524
Boson Index = 0.99431476
Help on Photoelectric: Photoelectric: PETornebohmite-(La) = 267.42 barns/electron
U=PETornebohmite-(La) x relectron=1,191.77 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 52,888.17 (Gamma Ray American Petroleum Institute Units)
Concentration of Tornebohmite-(La) per GRapi unit = 18.91 (PPM)

Tornebohmite-(La) 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) 575.11 ±143.78 grams of pure Tornebohmite-(La) .

Estimated Radioactivity from Tornebohmite-(La) - weak
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 / 7.28 cm 1,231,124 3.33E-05 52,888.17 17.39
100 gm / 3.38 cm 123,112 3.33E-06 5,288.82 1.74
10 gm / 1.57 cm 12,311 3.33E-07 528.88 0.17
1 gm / 7.28 mm 1,231 3.33E-08 52.89 0.02
0.1 gm / 3.38 mm 123 3.33E-09 5.29 0.00
0.01 gm / 1.57 mm 12 3.33E-10 0.53 0.00
0.001 gm / 0.73 mm 1 3.33E-11 0.05 0.00

Weight of pure Tornebohmite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.94 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
Estimated Thorium Activity ( 2.75 % Th) From Sum REE Elements (54.96 % REE)
 

Tornebohmite-(La) Classification

Help on  Dana Class: Dana Class: 52.04.05.02 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.04)with cations in [6] and/or > [6] coordination
  (52.04.05)Tornebohmite group
 
52.04.05.01 Tornebohmite-(Ce) (Ce,La,Nd)2Al(SiO4)2(OH) P 21/c 2/m
 
52.04.05.02 Tornebohmite-(La) (La,Ce)2Al(SiO4)2(OH) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 09.AG.45 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AG -Nesosilicates with additional anions; cations in > [6] � [6] coordination
 
09.AG.45 Tornebohmite-(Ce) (Ce,La,Nd)2Al(SiO4)2(OH) P 21/c 2/m
 
09.AG.45 Tornebohmite-(La) (La,Ce)2Al(SiO4)2(OH) P 21/c 2/m
 

Other Tornebohmite-(La) Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Tornebohmite-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Print or Cut-and-Paste your Tornebohmite-(La) Specimen Label here :

Tornebohmite-(La)

(La,Ce)2Al(SiO4)2(OH)
Dana No: 52.04.05.02 Strunz No: 09.AG.45
Locality:

 

Notes:

 

 
   
 


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