General Nordite-(La) Information
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Chemical Formula: |
(Na,Mn)3(Sr,Ca)(La,Ce)(Zn,Mg)Si6O17 |
Composition: |
Molecular Weight = 763.59 gm |
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Sodium 8.43 % Na 11.36 % Na2O |
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Strontium 5.74 % Sr 6.79 % SrO |
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Calcium 2.62 % Ca 3.67 % CaO |
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Lanthanum 9.10 % La 10.67 % La2O3 |
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Cerium 7.34 % Ce 8.60 % Ce2O3 |
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Magnesium 0.95 % Mg 1.58 % MgO |
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Manganese 2.88 % Mn 3.72 % MnO |
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Zinc 3.43 % Zn 4.26 % ZnO |
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Iron 2.19 % Fe 0.94 % FeO / 2.09 % Fe2O3 |
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Silicon 21.70 % Si 46.43 % SiO2 |
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Oxygen 35.62 % O |
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______ ______ |
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100.00 % 100.10 % = TOTAL OXIDE |
Empirical Formula: |
Na2.8Mn2+0.2Sr0.5Ca0.5La0.5Ce0.4Zn0.4Mg0.3Mn2+0.2Fe2+0.1Si5.9Fe3+0.2O17 |
Environment: |
Pegmatite in sodalite syenite in a differentiated alkalic massif. |
IMA Status: |
Valid Species (Pre-IMA) 1941 |
Locality: |
Near the Chinglusuai River, Lovozero Massif, Kola Pininuula, Russia. Link to MinDat.org Location Data. |
Name Origin: |
Named after the word for north because of its northern origin in the Lovozero Massif. |
Synonym: |
ICSD 15179 |
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PDF 41-584 |
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Nordite-(La) Crystallography
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Axial Ratios: |
a:b:c =2.7807:1:3.8208 |
Cell Dimensions: |
a = 14.468, b = 5.203, c = 19.88, Z = 4; V = 1,496.51 Den(Calc)= 3.39 |
Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcca |
X Ray Diffraction: |
By Intensity(I/Io): 2.86(1), 2.95(1), 1.764(0.8), |
Crystal Structure:
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Bakakin V V , Belov N V , Borisov S V , Solovyeva L P , American Mineralogist , 55 (1970) p.1167-1181, The crystal structure of nordite and its relationship to melilite and, datolite-gadolinite
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Physical Properties of Nordite-(La)
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Cleavage: |
[100] Good |
Color: |
Light brown, Dark brown, Blackish brown. |
Density: |
3.43 - 3.48, Average = 3.45 |
Diaphaniety: |
Translucent |
Fracture: |
Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments. |
Habit: |
Fibrous - Crystals made up of fibers. |
Habit: |
Metamict - Mineral originally crystalline, now amorphous due to radiation damage. |
Habit: |
Tabular - Form dimensions are thin in one direction. |
Hardness: |
5-6 - Between Apatite and Orthoclase |
Luster: |
Vitreous - Greasy |
Streak: |
light brown |
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Optical Properties of Nordite-(La)
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Gladstone-Dale: |
CI meas= 0.025 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1866,KPDmeas= 0.1831,KC= 0.1877 |
Optical Data: |
Biaxial (-), a=1.619-1.62, b=1.63-1.64, g=1.642-1.644, bire=0.0230-0.0240, 2V(Calc)=46-90, 2V(Meas)=31-32. |
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Calculated Properties of Nordite-(La)
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Electron Density: |
relectron=3.23 gm/cc note: rNordite-(La) =3.39 gm/cc. |
Fermion Index |
Fermion Index = 0.01726 Boson Index = 0.98274 |
Photoelectric: |
PENordite-(La) = 87.52 barns/electron U=PENordite-(La) x relectron= 282.49 barns/cc. |
Radioactivity: |
GRapi = 16,690.98 (Gamma Ray American Petroleum Institute Units)
Nordite-(La) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Nordite-(La) - 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 / 8.26 cm |
368,152 |
9.95E-06 |
16,690.98 |
5.49 |
| 100 gm / 3.83 cm |
36,815 |
9.95E-07 |
1,669.10 |
0.55 |
| 10 gm / 1.78 cm |
3,682 |
9.95E-08 |
166.91 |
0.05 |
| 1 gm / 8.26 mm |
368 |
9.95E-09 |
16.69 |
0.01 |
| 0.1 gm / 3.83 mm |
37 |
9.95E-10 |
1.67 |
0.00 |
| 0.01 gm / 1.78 mm |
4 |
9.95E-11 |
0.17 |
0.00 |
| 0.001 gm / 0.83 mm |
0 |
9.95E-12 |
0.02 |
0.00 |
Weight of pure Nordite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.39 gm/cc.*
Goverment Estimate of Average Annual Exposure (
360 mRem)
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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 ( 0.82 % Th) From Sum REE Elements (16.44 % REE)
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Nordite-(La) Classification
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Dana Class: |
72.5.2.3 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings |
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(72.5)with corrugated and complex layers |
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(72.5.2)Leucospenite and related species |
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72.5.2.1 Leucosphenite Na4BaTi2O2[B2Si10O28] C 2/m 2/m |
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72.5.2.2 Nordite-(Ce) (Ce,La,Ca)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m |
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72.5.2.3 Nordite-(La) (Na,Mn)3(Sr,Ca)(La,Ce)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m |
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72.5.2.4 Semenovite (Na,Ca)9(Ce,La)2(Fe,Mn)(Si,Be)20(O,OH,F)48 Pmmn 2/m 2/m 2/m |
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72.5.2.5 Ferronordite-(Ce)! Na3SrCeFeSi6O17 Pcca 2/m 2/m 2/m |
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72.5.2.6 Manganonordite-(Ce)! Na3SrCeMnSi6O17 Pcca 2/m 2/m 2/m |
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72.5.2.7 Ferronordite-(La)! Na3Sr(La,Ce)FeSi6O17 Pcca 2/m 2/m 2/m |
Strunz Class: |
VIII/G.03-30 VIII - Silicates |
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VIII/G - Intermediate between chain- and layered silicates |
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VIII/G.03 - Semenovite-(Ce) - Nordite-(La) series |
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VIII/G.03-10 Semenovite (Na,Ca)9(Ce,La)2(Fe,Mn)(Si,Be)20(O,OH,F)48 Pmmn 2/m 2/m 2/m |
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VIII/G.03-20 Nordite-(Ce) (Ce,La,Ca)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m |
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VIII/G.03-30 Nordite-(La) (Na,Mn)3(Sr,Ca)(La,Ce)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m |
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VIII/G.03-40 Ferronordite-(Ce)! Na3SrCeFeSi6O17 Pcca 2/m 2/m 2/m |
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VIII/G.03-45 Ferronordite-(La)! Na3Sr(La,Ce)FeSi6O17 Pcca 2/m 2/m 2/m |
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VIII/G.03-50 Manganonordite-(Ce)! Na3SrCeMnSi6O17 Pcca 2/m 2/m 2/m |
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Other Nordite-(La) Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2) |
See Also: |
Links to other databases for Nordite-(La) :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -MinDAT
8 -MinMax(Deutsch)
9 -MinMax(English)
10 -Mineralienatlas (Deutsch)
11 -QUT Mineral Atlas
12 - WWW-MINCRYST
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Print or Cut-and-Paste your Nordite-(La) Specimen Label here :
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Nordite-(La)
(Na,Mn)3(Sr,Ca)(La,Ce)(Zn,Mg)Si6O17
Dana No: 72.5.2.3 Strunz No: VIII/G.03-30
Locality:
Notes:
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