Seidite-(Ce) Mineral Data

Advertisment

Exceptional Minerals features excellent, high quality mineral specimens for sale. We also have a weekly Best Offer Mineral Auction.

McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

Your premier supplier of quality mineral specimens from Southern Africa and the world at large

General Seidite-(Ce) Information

Chemical Formula:

Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4•5(H2O)

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

Empirical Formula:

Na₄Ce_1.5Sr_0.5Ti(OH)₂Si₈O₁₈O_2.4(OH)_1.2F_0.4·5(H₂O)

Environment:

In cavernous natrolite in the Jubileinaya hyperagpaitic pegmatites. Na cations are exchangable indicating a micro-porous structure.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Found at Mount Karnasurt, Lovozero alkaline complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after Seidozero, literally Lake Seid, the central lake in the Lovozero complex.

Synonym:

IMA1993-029

Seidite-(Ce) Image

Images:

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

Axial Ratios:

a:b:c =3.4038:1:2.0096

Cell Dimensions:

a = 24.61, b = 7.23, c = 14.53, Z = 4; beta = 94.6° V = 2,577.00 Den(Calc)= 2.83

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C/2c

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

By Intensity(I/I_o): 12.32(1), 3.22(0.86), 3.108(0.29),3.14(0.24), 3.081(0.16), 3.058(0.12),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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)

Cleavage:

{100} Perfect, {001} Very Good

Color:

Yellow, Pinkish yellow, Cream.

Density:

2.76

Diaphaneity:

Translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Seidite-(Ce)

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
Ncalc = 1.6 - 1.62

Optical Data:

Biaxial (-), a=1.542, b=1.569, g=1.571, bire=0.0290

Calculated Properties of Seidite-(Ce)

Electron Density:

Bulk Density (Electron Density)=2.66 gm/cc
note: Specific Gravity of Seidite-(Ce) =2.76 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Seidite-(Ce)= 97.68 barns/electron
U=PE_Seidite-(Ce) x r_electron= 260.32 barns/cc.

Radioactivity:

GRapi = 19,732.19 (Gamma Ray American Petroleum Institute Units)
Concentration of Seidite-(Ce) per GRapi unit = 50.68 (PPM)

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 Becquerels (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	19,732.19	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

Dana Class:

72.05.01.06 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.05)with corrugated and complex layers

(72.05.01)Rhodesite group

72.05.01.01 Rhodesite KHCa2Si8O19•5(H2O) Pmam 2/m 2/m 2/m

72.05.01.02 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38•10(H2O) P 2₁/m 2/m

72.05.01.03 Macdonaldite BaCa4[Si16O36(OH)2]•10(H2O) C mcm 2/m 2/m 2/m

72.05.01.04 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3•18(H2O) Pnmm 2/m 2/m 2/m

72.05.01.05 Hydrodelhayelite KCa2AlSi7O17(OH)2•6(H2O) Pnm21 mm2

72.05.01.06 Seidite-(Ce)! Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4•5(H2O) C/2c 2/m

Strunz Class:

09.DJ.20 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DJ -Inosilicates with 4-periodic double and triple chains

09.DJ.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

References:

NAME( CanMin, 8/99) PHYS. PROP.(MinRec, v 31, No. 2, CanMin, v 41, p 1183) OPTIC PROP.(MinRec, V 31, No. 2)

See Also:

Links to other databases for Seidite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Seidite-(Ce) using:

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

Visit our Advertisers for Seidite-(Ce) :

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

Ask about Seidite-(Ce) 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 Seidite-(Ce) Specimen Label here :

Seidite-(Ce)

Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4•5(H2O)
Dana No: 72.05.01.06 Strunz No: 09.DJ.20
Locality:

Notes: