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Ilmajokite Mineral Data

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General Ilmajokite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ce,La,Ba)2TiSi3O5(OH)10•n(H2O) (?)
Help on Composition: Composition: Molecular Weight = 544.12 gm
   Barium      5.05 %  Ba    5.64 % BaO
   Sodium      6.34 %  Na    8.54 % Na2O
   Lanthanum   2.55 %  La    2.99 % La2O3
   Cerium      2.58 %  Ce    3.02 % Ce2O3
   Titanium    8.80 %  Ti   14.68 % TiO2
   Silicon    15.48 %  Si   33.13 % SiO2
   Hydrogen    3.33 %  H    29.80 % H2O
   Oxygen     55.87 %  O
             ______        ______ 
             100.00 %       97.79 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.5Ce0.1La0.1Ba0.2TiSi3O5(OH)10•4(H2O)
Help on Environment: Environment: Cavities in the central zone of the Jubilee stratified pegmatite. Rapidly disintegrates in air.
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Lovozero alkaline massif, near the Ilmajok river valley, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Ilmajokite + Pronunciation Say ILMAJOKITE
 

Ilmajokite Image

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  Ilmajokite

Comments: Opaque dull yellow ilmajokite in syenite matrix.
Location: valley of Ilmajok River, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ilmajokite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9426:1:1.5163
Help on Cell Dimensions: Cell Dimensions: a = 23, b = 24.4, c = 37, Z = 50; beta = 96.38° V = 20,635.80 Den(Calc)= 2.19
Help on Crystal System: Crystal System: Monoclinic Space Group: C 2/c or Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.44(1), 4.3(1), 11.5(1),
 

Physical Properties of Ilmajokite

Help on Cleavage: Cleavage: {???} Perfect, {???} Perfect
Help on Color: Color: Bright yellow, Light yellow.
Help on Density: Density: 2.2
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 1 - Talc
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Ilmajokite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.263,KPDmeas= 0.2618,KC= 0.2601
Ncalc = 1.57
Help on Optical Data: Optical Data: Biaxial (+), a=1.573, b=1.576, g=1.579, bire=0.0060, 2V(Calc)=88, 2V(Meas)=90.
 

Calculated Properties of Ilmajokite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.21 gm/cc
note: Specific Gravity of Ilmajokite =2.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEIlmajokite = 45.12 barns/electron
U=PEIlmajokite x relectron= 99.69 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 5,492.68 (Gamma Ray American Petroleum Institute Units)
Concentration of Ilmajokite per GRapi unit = 182.06 (PPM)

Ilmajokite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Ilmajokite - mild
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 / 9.54 cm 114,865 3.10E-06 5,492.68 1.81
100 gm / 4.43 cm 11,487 3.10E-07 549.27 0.18
10 gm / 2.06 cm 1,149 3.10E-08 54.93 0.02
1 gm / 9.54 mm 115 3.10E-09 5.49 0.00
0.1 gm / 4.43 mm 11 3.10E-10 0.55 0.00
0.01 gm / 2.06 mm 1 3.10E-11 0.05 0.00
0.001 gm / 0.95 mm 0 3.10E-12 0.01 0.00

Weight of pure Ilmajokite in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.20 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 ( 0.26 % Th) From Sum REE Elements ( 5.13 % REE)
 

Ilmajokite Classification

Help on  Dana Class: Dana Class: 78.07.05.01 (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.05)Dana Group
 
78.07.05.01 Ilmajokite (Na,Ce,La,Ba)2TiSi3O5(OH)10•n(H2O)(?) C 2/c or Cc Mono
Help on  Strunz Class: Strunz Class: 09.HB.05 09 - SILICATES (Germanates)
  09.H - Unclassified Silicates
  09.HB -With Ti, V, Cr
 
09.HB.05 Ilmajokite (Na,Ce,La,Ba)2TiSi3O5(OH)10•n(H2O)(?) C 2/c or Cc Mono
 

Other Ilmajokite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ilmajokite :
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

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Ilmajokite

(Na,Ce,La,Ba)2TiSi3O5(OH)10•n(H2O) (?)
Dana No: 78.07.05.01 Strunz No: 09.HB.05
Locality:

 

Notes:

 

 
   
 


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