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Ilimaussite-(Ce) Mineral Data

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General Ilimaussite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ba,Na)10K3Na4.5Ce5(Nb,Ti)6[Si12O36][Si9O18(O,OH)24]O6
Help on Composition: Composition: Molecular Weight = 4,253.30 gm
   Potassium       3.25 %  K     3.92 % K2O
   Barium         22.05 %  Ba   24.62 % BaO
   Sodium          3.79 %  Na    5.11 % Na2O
   Strontium       0.06 %  Sr    0.07 % SrO
   Lanthanum       2.65 %  La    3.10 % La2O3
   Cerium          6.72 %  Ce    7.87 % Ce2O3
   Praeseodymium   2.15 %  Pr    2.52 % Pr2O3
   Thorium         1.04 %  Th    1.18 % ThO2
   Titanium        2.11 %  Ti    3.51 % TiO2
   Manganese       0.23 %  Mn    0.33 % Mn2O3
   Niobium         7.47 %  Nb   10.69 % Nb2O5
   Aluminum        0.20 %  Al    0.38 % Al2O3
   Iron            1.37 %  Fe    1.95 % Fe2O3
   Silicon        13.66 %  Si   29.21 % SiO2
   Hydrogen        0.48 %  H     4.30 % H2O
   Neodymium       1.05 %  Nd    1.23 % Nd2O3
   Oxygen         31.20 %  O
   Fluorine        0.52 %  F     0.52 % F
                    -   %   F    -0.22 % -O=F2    
                 ______        ______ 
                 100.00 %      100.31 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba6.83K3.54Na7.02Sr0.03Ce2.04La0.81Nd0.315(Pr0.13)Th0.19Fe3+1.04Mn3+0.18Nb3.42Ti1.87 Si20.68Al0.32O62.64(OH)20.29F1.17
Help on Environment: Environment: Analcime-ussingite pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: Ilimaussaq alkaline complex, South Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Ilimaussite-(Ce) + Pronunciation Say ILIMAUSSITE-(CE)
 

Ilimaussite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:5.66852
Help on Cell Dimensions: Cell Dimensions: a = 10.77, c = 61.05, Z = 3; V = 6,132.65 Den(Calc)= 3.45
Help on Crystal System: Crystal System: Trigonal - Pyramidal H-M Symbol (3) Space Group: R 32
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.67(1), 3.25(0.6), 3.12(0.5),
 

Physical Properties of Ilimaussite-(Ce)

Help on Color: Color: Brownish yellow, Yellowish white.
Help on Density: Density: 3.6
Help on Diaphaneity: Diaphaneity: Transparent to Subtranslucent
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white
 

Optical Properties of Ilimaussite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2006,KPDmeas= 0.1922,KC= 0.1982
Ncalc = 1.68 - 1.71
Help on Optical Data: Optical Data: Uniaxial (+), w=1.689, e=1.695, bire=0.0060.
 

Calculated Properties of Ilimaussite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Ilimaussite-(Ce) =3.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEIlimaussite-(Ce) = 195.79 barns/electron
U=PEIlimaussite-(Ce) x relectron= 624.90 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 20,501.23 (Gamma Ray American Petroleum Institute Units)
Concentration of Ilimaussite-(Ce) per GRapi unit = 48.78 (PPM)

Ilimaussite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Ilimaussite-(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 / 8.21 cm 465,356 1.26E-05 20,501.23 6.74
100 gm / 3.81 cm 46,536 1.26E-06 2,050.12 0.67
10 gm / 1.77 cm 4,654 1.26E-07 205.01 0.07
1 gm / 8.21 mm 465 1.26E-08 20.50 0.01
0.1 gm / 3.81 mm 47 1.26E-09 2.05 0.00
0.01 gm / 1.77 mm 5 1.26E-10 0.21 0.00
0.001 gm / 0.82 mm 0 1.26E-11 0.02 0.00

Weight of pure Ilimaussite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.45 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
 

Ilimaussite-(Ce) Classification

Help on  Dana Class: Dana Class: 78.07.04.01 (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.04)Dana Group
 
78.07.04.01 Ilimaussite-(Ce) (Ba,Na)10K3Na4.5Ce5(Nb,Ti)6[Si12O36][Si9O18(O,OH)24]O6 R 32 3
 
78.07.04.02 Diversilite-(Ce)! Na2(Ba,K)6Ce2FeTi3Si12O36(OH)3(OH,H2O)9 R 32 3
Help on  Strunz Class: Strunz Class: 09.CB.15 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CB -[Si3O9]6- 3-membered single rings, with insular complex anions
 
09.CB.15 Ilimaussite-(Ce) (Ba,Na)10K3Na4.5Ce5(Nb,Ti)6[Si12O36][Si9O18(O,OH)24]O6 R 32 3
 

Other Ilimaussite-(Ce) Information

Help on References: References: NAME( CanMin, v 42, p 787) PHYS. PROP.(CanMin, 42:787) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ilimaussite-(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

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

Ilimaussite-(Ce)

(Ba,Na)10K3Na4.5Ce5(Nb,Ti)6[Si12O36][Si9O18(O,OH)24]O6
Dana No: 78.07.04.01 Strunz No: 09.CB.15
Locality:

 

Notes:

 

 
   
 


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