Mineralogy Database

Tornebohmite-(Ce) Mineral Data

Search Webmineral :
  
Advertisment

General Tornebohmite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ce,La,Nd)2Al(SiO4)2(OH)
Help on Composition: Composition: Molecular Weight = 509.02 gm
   Lanthanum  13.64 %  La   16.00 % La2O3
   Cerium     33.03 %  Ce   38.69 % Ce2O3
   Aluminum    5.30 %  Al   10.02 % Al2O3
   Silicon    11.04 %  Si   23.61 % SiO2
   Hydrogen    0.20 %  H     1.77 % H2O
   Neodymium   8.50 %  Nd    9.92 % Nd2O3
   Oxygen     28.29 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce1.2La0.5Nd0.3Al(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: Bastnaes mine near 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-(Ce) + Pronunciation Say TORNEBOHMITE-(CE)
 

Tornebohmite-(Ce) Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Tornebohmite-(Ce)

Comments: Vein of dark green tornebohmite-(Ce) with selveges of black allanite-(Ce) in a K-feldspar matrix.
Location: Jamestown District, Boulder Co., Colorado, USA. Scale: Specimen Size 6.5 x 3.8 x 2.5 cm.
© Rob Lavinsky

Tornebohmite-(Ce) 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)= 5.14
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): 3.08(1), 2.82(0.9), 2.01(0.6),
 

Physical Properties of Tornebohmite-(Ce)

Help on Color: Color: Green, Green.
Help on Density: Density: 4.9
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Adamantine
 

Optical Properties of Tornebohmite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.167,KPDmeas= 0.1752,KC= 0.1688
Ncalc = 1.83 - 1.87
Help on Optical Data: Optical Data: Biaxial (+), a=1.845, b=1.852, g=1.878, bire=0.0330, 2V(Calc)=56, 2V(Meas)=26. Dispersion strong, r < v.
Help on Pleochroism (x): Pleochroism (x): rose.
Help on Pleochroism (y): Pleochroism (y): rose.
Help on Pleochroism (z): Pleochroism (z): bluish green.
 

Calculated Properties of Tornebohmite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.65 gm/cc
note: Specific Gravity of Tornebohmite-(Ce) =5.14 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PETornebohmite-(Ce) = 283.48 barns/electron
U=PETornebohmite-(Ce) x relectron=1,317.34 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 53,211.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Tornebohmite-(Ce) per GRapi unit = 18.79 (PPM)

Tornebohmite-(Ce) 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) 571.62 ±142.91 grams of pure Tornebohmite-(Ce) .

Estimated Radioactivity from Tornebohmite-(Ce) - 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 / 7.19 cm 1,235,974 3.34E-05 53,211.27 17.49
100 gm / 3.34 cm 123,597 3.34E-06 5,321.13 1.75
10 gm / 1.55 cm 12,360 3.34E-07 532.11 0.17
1 gm / 7.19 mm 1,236 3.34E-08 53.21 0.02
0.1 gm / 3.34 mm 124 3.34E-09 5.32 0.00
0.01 gm / 1.55 mm 12 3.34E-10 0.53 0.00
0.001 gm / 0.72 mm 1 3.34E-11 0.05 0.00

Weight of pure Tornebohmite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.14 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 ( 2.76 % Th) From Sum REE Elements (55.18 % REE)
 

Tornebohmite-(Ce) Classification

Help on  Dana Class: Dana Class: 52.04.05.01 (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-(Ce) Information

Help on References: References: NAME( Ford32) 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 Tornebohmite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

Search for Tornebohmite-(Ce) using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Tornebohmite-(Ce) :

Ask about Tornebohmite-(Ce) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Tornebohmite-(Ce)

(Ce,La,Nd)2Al(SiO4)2(OH)
Dana No: 52.04.05.01 Strunz No: 09.AG.45
Locality:

 

Notes:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.