Ilmajokite Mineral Data

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.

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= -0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2642,KPDmeas= 0.2618,KC= 0.2601

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:

r_electron=2.21 gm/cc
note: r_Ilmajokite=2.20 gm/cc.

Fermion Index

Fermion Index = 0.0279
Boson Index = 0.9721

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)

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

Dana Class:

78.7.5.1 (78)Unclassified silicates

(78.7)wholly unclassified silicates

(78.7.5)Dana Group

78.7.5.1 Ilmajokite (Na,Ce,La,Ba)2TiSi3O5(OH)10·n(H2O)(?) C 2/c or Cc Mono

Strunz Class:

VIII/B.16-20 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.16 - Ilmajokite - Tundrite-(Nd) series

VIII/B.16-20 Ilmajokite (Na,Ce,La,Ba)2TiSi3O5(OH)10·n(H2O)(?) C 2/c or Cc Mono

VIII/B.16-30 Sitinakite Na2K(Ti,Nb)4O4(SiO4)2(O,OH)·4(H2O) P 4₁/mcm 4/m 2/m 2/m

VIII/B.16-40 Tundrite-(Ce) Na3(Ce,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)·2(H2O) P1 1

VIII/B.16-50 Tundrite-(Nd) Na3(Nd,La)4(Ti,Nb)2(SiO4)2(CO3)3O4(OH)·2(H2O) P1 1

Other Ilmajokite Information

References:

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

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Ilmajokite

(Na,Ce,La,Ba)2TiSi3O5(OH)10·n(H2O) (?)
Dana No: 78.7.5.1 Strunz No: VIII/B.16-20
Locality:

Notes: