Nordite-(La) Mineral Data

Nordite-(La) Mineral Data +

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General Nordite-(La) Information

Chemical Formula:

(Na,Mn)3(Sr,Ca)(La,Ce)(Zn,Mg)Si6O17

Composition:

Molecular Weight = 763.59 gm

Sodium 8.43 % Na 11.36 % Na₂O

Strontium 5.74 % Sr 6.79 % SrO

Calcium 2.62 % Ca 3.67 % CaO

Lanthanum 9.10 % La 10.67 % La₂O₃

Cerium 7.34 % Ce 8.60 % Ce₂O₃

Magnesium 0.95 % Mg 1.58 % MgO

Manganese 2.88 % Mn 3.72 % MnO

Zinc 3.43 % Zn 4.26 % ZnO

Iron 2.19 % Fe 0.94 % FeO / 2.09 % Fe₂O₃

Silicon 21.70 % Si 46.43 % SiO₂

Oxygen 35.62 % O

______ ______

100.00 % 100.10 % = TOTAL OXIDE

Empirical Formula:

Na_2.8Mn²⁺_0.2Sr_0.5Ca_0.5La_0.5Ce_0.4Zn_0.4Mg_0.3Mn²⁺_0.2Fe²⁺_0.1Si_5.9Fe³⁺_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

PDF 41-584

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Nordite-(La) Crystallography

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

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

By Intensity(I/I_o): 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

Physical Properties of Nordite-(La)

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

Optical Properties of Nordite-(La)

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.

Calculated Properties of Nordite-(La)

Electron Density:

r_electron=3.23 gm/cc
note: r_Nordite-(La)=3.39 gm/cc.

Fermion Index

Fermion Index = 0.01726
Boson Index = 0.98274

Photoelectric:

PE_Nordite-(La)= 87.52 barns/electron
U=PE_Nordite-(La) x r_electron= 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) **
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)

Nordite-(La) Classification

Dana Class:

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

(72.5)with corrugated and complex layers

(72.5.2)Leucospenite and related species

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

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

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

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

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

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

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

VIII/G - Intermediate between chain- and layered silicates

VIII/G.03 - Semenovite-(Ce) - Nordite-(La) series

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

VIII/G.03-20 Nordite-(Ce) (Ce,La,Ca)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m

VIII/G.03-30 Nordite-(La) (Na,Mn)3(Sr,Ca)(La,Ce)(Zn,Mg)Si6O17 Pcca 2/m 2/m 2/m

VIII/G.03-40 Ferronordite-(Ce)! Na3SrCeFeSi6O17 Pcca 2/m 2/m 2/m

VIII/G.03-45 Ferronordite-(La)! Na3Sr(La,Ce)FeSi6O17 Pcca 2/m 2/m 2/m

VIII/G.03-50 Manganonordite-(Ce)! Na3SrCeMnSi6O17 Pcca 2/m 2/m 2/m

Other Nordite-(La) Information

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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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: