Ilmajokite Mineral Data

General Ilmajokite Information

Chemical Formula:

(Na,Ce,La,Ba)2TiSi3O5(OH)10•n(H2O) (?)

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

Empirical Formula:

Na_1.5Ce_0.1La_0.1Ba_0.2TiSi₃O₅(OH)₁₀•4(H₂O)

Environment:

Cavities in the central zone of the Jubilee stratified pegmatite. Rapidly disintegrates in air.

IMA Status:

Approved IMA 1972

Locality:

Lovozero alkaline massif, near the Ilmajok river valley, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Ilmajokite + Pronunciation

Ilmajokite Image

Images:

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

Axial Ratios:

a:b:c =0.9426:1:1.5163

Cell Dimensions:

a = 23, b = 24.4, c = 37, Z = 50; beta = 96.38° V = 20,635.80 Den(Calc)= 2.19

Crystal System:

MonoclinicSpace Group: C 2/c or Cc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.44(1), 4.3(1), 11.5(1),

Physical Properties of Ilmajokite

Cleavage:

{???} Perfect, {???} Perfect

Color:

Bright yellow, Light yellow.

Density:

2.2

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

1 - Talc

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ilmajokite

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

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

Electron Density:

Bulk Density (Electron Density)=2.21 gm/cc
note: Specific Gravity of Ilmajokite =2.20 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Ilmajokite= 45.12 barns/electron
U=PE_Ilmajokite x r_electron= 99.69 barns/cc.

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 Becquerels (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

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

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Search for Ilmajokite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ilmajokite :

A Bijoux Google Search for Ilmajokite
Adam's Minerals Google Search for Ilmajokite
Cape Minerals Google Search for Ilmajokite
Dakota Matrix Minerals Google Search for Ilmajokite
Excalibur Mineral Corp. Google Search for Ilmajokite
Exceptional Minerals Google Search for Ilmajokite
John Betts Fine Minerals Search for Ilmajokite
McDougall Minerals Google Search for Ilmajokite
Mineral News Website Link
Rock and Mineral Shows Google Search for Ilmajokite
Weinrich Minerals, Inc. Google Search for Ilmajokite

Ask about Ilmajokite 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 Ilmajokite Specimen Label here :

Ilmajokite

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

Notes: