Seidite-(Ce) Mineral Data

General Seidite-(Ce) Information
Help on Chemical Formula: Chemical Formula: Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4·5(H2O)
Help on Composition: Composition: Molecular Weight = 1,096.99 gm
   Sodium      8.38 %  Na   11.30 % Na2O
   Strontium   3.99 %  Sr    4.72 % SrO
   Cerium     19.16 %  Ce   22.44 % Ce2O3
   Titanium    4.36 %  Ti    7.28 % TiO2
   Silicon    20.48 %  Si   43.82 % SiO2
   Hydrogen    1.21 %  H    10.84 % H2O
   Oxygen     41.71 %  O
   Fluorine    0.69 %  F     0.69 % F
                -   %  F    -0.29 % -O=F2
             ______        ______ 
             100.00 %      100.80 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na4Ce1.5Sr0.5Ti(OH)2Si8O18O2.4(OH)1.2F0.4·5(H2O)
Help on Environment: Environment: In cavernous natrolite in the Jubileinaya hyperagpaitic pegmatites. Na cations are exchangable indicating a micro-porous structure.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: Found at Mount Karnasurt, Lovozero alkaline complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Seidozero, literally Lake Seid, the central lake in the Lovozero complex.
Help on Synonym: Synonym: IMA1993-029
 

Seidite-(Ce) Image

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Seidite-(Ce)

Comments: Scanning Electron image of seidite-(Ce) with the axial components of a and c superimposed on crystal.
Location: Yubileynaya pegmatite at Mount Karnasurt, Lovozero alkaline massif, Kola Peninsula, Russia. Scale: Image size 0.5 mm.
© Canadian Mineralogist

Seidite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =3.4038:1:2.0096
Help on Cell Dimensions: Cell Dimensions: a = 24.61, b = 7.23, c = 14.53, Z = 4; beta = 94.6° V = 2,577.00 Den(Calc)= 2.83
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C/2c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.32(1), 3.22(0.86), 3.108(0.29),3.14(0.24), 3.081(0.16), 3.058(0.12),
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Ferraris G , Belluso E , Gula A , Soboleva S V , Khomyakov A P , The Canadian Mineralogist , 41 (2003) p.1183-1192, The crystal structure of seidite-(Ce), Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4.5H2O,, a modular microporous titanosilicate of the rhodesite group

 

Physical Properties of Seidite-(Ce)

Help on Cleavage: Cleavage: [100] Perfect, [001] Very Good
Help on Color: Color: Yellow, Pinkish yellow, Cream.
Help on Density: Density: 2.76
Help on Diaphaniety: Diaphaniety: Translucent
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white
 

Optical Properties of Seidite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.066 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1981,KPDmeas= 0.2031,KC= 0.2176
Help on Optical Data: Optical Data: Biaxial (-), a=1.542, b=1.569, g=1.571, bire=0.0290
 

Calculated Properties of Seidite-(Ce)

Help on Electron Density: Electron Density:

relectron=2.66 gm/cc
note: rSeidite-(Ce) =2.76 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0182
Boson Index = 0.9818
Help on Photoelectric: Photoelectric:

PESeidite-(Ce) = 97.68 barns/electron
U=PESeidite-(Ce) x relectron= 260.32 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 19,732.18 (Gamma Ray American Petroleum Institute Units)

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

Estimated Radioactivity from Seidite-(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 / 8.84 cm 429,161 1.16E-05 19,732.18 6.49
100 gm / 4.11 cm 42,916 1.16E-06 1,973.22 0.65
10 gm / 1.91 cm 4,292 1.16E-07 197.32 0.06
1 gm / 8.84 mm 429 1.16E-08 19.73 0.01
0.1 gm / 4.11 mm 43 1.16E-09 1.97 0.00
0.01 gm / 1.91 mm 4 1.16E-10 0.20 0.00
0.001 gm / 0.88 mm 0 1.16E-11 0.02 0.00

Weight of pure Seidite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.76 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 ( 0.96 % Th) From Sum REE Elements (19.16 % REE)
 

Seidite-(Ce) Classification
Help on Dana Class: Dana Class: 72.5.1.6 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.5)with corrugated and complex layers
  (72.5.1)Rhodesite group
 
72.5.1.1 Rhodesite KHCa2Si8O19·5(H2O) Pmam 2/m 2/m 2/m
 
72.5.1.2 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38·10(H2O) P 21/m 2/m
 
72.5.1.3 Macdonaldite BaCa4[Si16O36(OH)2]·10(H2O) C mcm 2/m 2/m 2/m
 
72.5.1.4 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O) Pnmm 2/m 2/m 2/m
 
72.5.1.5 Hydrodelhayelite KCa2AlSi7O17(OH)2·6(H2O) Pnm21 mm2
 
72.5.1.6 Seidite-(Ce) ! Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4·5(H2O) C/2c 2/m
Help on Strunz Class: Strunz Class: VIII/G.11-20 VIII - Silicates
  VIII/G - Intermediate between chain- and layered silicates
  VIII/G.11 - Laplandite-(Ce) series
 
VIII/G.11-10 Laplandite-(Ce) Na4CeTiPSi7O22·5(H2O) P mmm 2/m 2/m 2/m
 
VIII/G.11-20 Seidite-(Ce) Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4·5(H2O) C/2c 2/m
 

Other Seidite-(Ce) Information
Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(MinRec, v 31, No. 2, CanMin, v 41, p 1183) OPTIC PROP.(MinRec, V 31, No. 2)
Help on See Also: See Also: Links to other databases for Seidite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Seidite-(Ce)

Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4·5(H2O)
Dana No: 72.5.1.6 Strunz No: VIII/G.11-20
Locality:

 

Notes:

 
 
   
 
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