Semenovite Mineral Data (original) (raw)

General Semenovite Information

Help on Chemical Formula: Chemical Formula:

(Na,Ca)9(Ce,La)2(Fe++,Mn)(Si,Be)20(O,OH,F)48

Help on Composition: Composition:

Molecular Weight = 1,875.54 gm

Potassium 0.08 % K 0.10 % K2O

Sodium 8.26 % Na 11.14 % Na2O

Calcium 4.36 % Ca 6.10 % CaO

Lanthanum 5.92 % La 6.95 % La2O3

Cerium 5.53 % Ce 6.48 % Ce2O3

La,Ce,Pr,Nd,Sm, 3.38 % RE 3.94 % REE2O3

Yttrium 1.52 % Y 1.93 % Y2O3

Manganese 1.41 % Mn 1.82 % MnO

Beryllium 3.00 % Be 8.32 % BeO

Aluminum 0.37 % Al 0.71 % Al2O3

Zinc 0.42 % Zn 0.52 % ZnO

Iron 2.32 % Fe 0.80 % FeO / 2.43 % Fe2O3

Silicon 20.29 % Si 43.41 % SiO2

Hydrogen 0.22 % H 1.94 % H2O

Lead 0.44 % Pb 0.48 % PbO

Oxygen 37.91 % O

Fluorine 4.57 % F 4.57 % F

- % F -1.92 % -O=F2

______ ______

100.00 % 99.69 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Na6.74Ca2.04K0.04La0.8Ce0.74Y0.32REE0.44Mn2+0.48Fe2+0.21Zn0.12Pb0.04Fe3+0.57Si13.55Be6.24Al0.26O40.4F4.51(OH)4.04

Help on Environment: Environment:

Occurs in border zone of the only epididymite-eudidymite bearing albitite, in cavities and fractures.

Help on IMA Status: IMA Status:

Approved IMA 1972

Help on Locality: Locality:

Ilimaussaq complex, South Greenland. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Yevgeny Ivanovich Semenov, (1951-), Russian mineralogist, IMGRE, Moscow, Russia.

Help on Name Pronunciation: Name Pronunciation:

Semenovite + Pronunciation Say SEMENOVITE

Semenovite Image

Click Here for Larger Semenovite Image in a New Browser Window Images:

Click Here for Larger Semenovite Image Semenovite Comments: Tan crystals of semenovite to 1 mm across on matrix. Location: Ilimaussaq, Tasseq, Greenland.Scale: Picture size 1 cm. © John Veevaert

Semenovite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =1.0031:1:0.7186

Help on Cell Dimensions: Cell Dimensions:

a = 13.879, b = 13.835, c = 9.942, Z = 2; V = 1,909.02 Den(Calc)= 3.26

Help on Crystal System: Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmmn

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.73(1), 2.84(1), 3.28(1),

Click Here for Large Semenovite Structure Window Crystal Structure:

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| | Mazzi F , Ungaretti L , Dal Negro A , Petersen O V , Ronsbo J G , American Mineralogist , 64 (1979) p.202-210, The crystal structure of semenovite | | ----------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Semenovite

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Brown, Orange brown, Gray, Reddish brown, Colorless.

Help on Density: Density:

3.14

Help on Diaphaneity: Diaphaneity:

Transparent to translucent

Help on Fracture: Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Help on Habit: Habit:

Pseudo Tetragonal - Crystals show a tetragonal shape.

Help on Habit: Habit:

Twinning Common - Crystals are usually twinned.

Help on Hardness: Hardness:

3.5-4 - Copper Penny-Fluorite

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

white

Optical Properties of Semenovite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1864,KPDmeas= 0.1935,KC= 0.1968
Ncalc = 1.62 - 1.64

Help on Optical Data: Optical Data:

Biaxial (-), a=1.595, b=1.614, g=1.614, bire=0.0190, 2V(Calc)=0, 2V(Meas)=0-55.

Calculated Properties of Semenovite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Semenovite =3.14 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Help on Photoelectric: Photoelectric:

PESemenovite = 84.76 barns/electron
U=PESemenovite x relectron= 255.67 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 15,211.68 (Gamma Ray American Petroleum Institute Units)
Concentration of Semenovite per GRapi unit = 65.74 (PPM)

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

Estimated Radioactivity from Semenovite - weak

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor One Hour
1000 gm / 8.47 cm 332,522 8.99E-06 15,211.68 5.00
100 gm / 3.93 cm 33,252 8.99E-07 1,521.17 0.50
10 gm / 1.83 cm 3,325 8.99E-08 152.12 0.05
1 gm / 8.47 mm 333 8.99E-09 15.21 0.01
0.1 gm / 3.93 mm 33 8.99E-10 1.52 0.00
0.01 gm / 1.83 mm 3 8.99E-11 0.15 0.00
0.001 gm / 0.85 mm 0 8.99E-12 0.02 0.00

Weight of pure Semenovite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.14 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 ( 0.74 % Th) From Sum REE Elements (14.83 % REE)

Semenovite Classification

Help on Dana Class: Dana Class:

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

(72.05)with corrugated and complex layers

(72.05.02)Leucospenite and related species

72.05.02.01 Leucosphenite Na4BaTi2O2[B2Si10O28] C 2/m 2/m

72.05.02.02 Nordite-(Ce) (Ce,La,Ca)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m

72.05.02.03 Nordite-(La) (Na,Mn)3(Sr,Ca)(La,Ce)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m

72.05.02.04 Semenovite (Na,Ca)9(Ce,La)2(Fe,Mn)(Si,Be)20(O,OH,F)48 Pmmn 2/m 2/m 2/m

72.05.02.05 Ferronordite-(Ce)! Na3SrCeFeSi6O17 Pcca 2/m 2/m 2/m

72.05.02.06 Manganonordite-(Ce)! Na3SrCeMnSi6O17 Pcca 2/m 2/m 2/m

72.05.02.07 Ferronordite-(La)! Na3Sr(La,Ce)FeSi6O17 Pcca 2/m 2/m 2/m

72.05.02.08 Bussyite-(Ce)! (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 C 2/c 2/m

Help on Strunz Class: Strunz Class:

09.DN.10 09 - SILICATES (Germanates)

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

09.DN -Inosilicates with 6-periodic double chains

09.DN.10 Semenovite (Na,Ca)9(Ce,La)2(Fe,Mn)(Si,Be)20(O,OH,F)48 Pmmn 2/m 2/m 2/m

Other Semenovite Information

Help on References: References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

Help on See Also: See Also:

Links to other databases for Semenovite :
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
11 - WWW-MINCRYST

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Ask about Semenovite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Semenovite Specimen Label here :

Semenovite

(Na,Ca)9(Ce,La)2(Fe++,Mn)(Si,Be)20(O,OH,F)48
Dana No: 72.05.02.04 Strunz No: 09.DN.10
Locality:

Notes: