Manganonordite-(Ce) Mineral Data

Manganonordite-(Ce) Mineral Data +

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General Manganonordite-(Ce) Information

Chemical Formula:

Na3SrCeMn++Si6O17

Composition:

Molecular Weight = 792.15 gm

Sodium 8.71 % Na 11.74 % Na₂O

Strontium 11.06 % Sr 13.08 % SrO

Cerium 17.69 % Ce 20.72 % Ce₂O₃

Manganese 6.94 % Mn 8.96 % MnO

Silicon 21.27 % Si 45.51 % SiO₂

Oxygen 34.34 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₃SrCeMn²⁺Si₆O₁₇

Environment:

In the central (ussingite) zone of hyperagpaitic pegmatite in sodalite nepheline syenites and in ussingite veinlets. The manganese analogue of nordite-(Ce) and ferronordite-(Ce).

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Chinlusuia River, Lovozero Alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the Mn++ dominant analogue of nordite-(Ce). Nordite series is named after the word for north because of its northern origin in the Lovozero Massif.

Synonym:

ICSD 88885

IMA1997-007

PDF 50-1638

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Manganonordite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.7234:1:0.2575

Cell Dimensions:

a = 14.86, b = 20.54, c = 5.29, Z = 4; V = 1,614.64 Den(Calc)= 3.26

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): 4.215(1), 2.965(0.83), 3.326(0.67),

Physical Properties of Manganonordite-(Ce)

Cleavage:

[100] Perfect

Color:

Pale brown, Colorless, Brown.

Density:

3.43 - 3.56, Average = 3.49

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Manganonordite-(Ce)

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1944,KPDmeas= 0.1813,KC= 0.1834

Optical Data:

Biaxial (+), a=1.623, b=1.636, g=1.642, bire=0.0190, 2V(Calc)=66, 2V(Meas)=60. Dispersion weak, r > v.

Calculated Properties of Manganonordite-(Ce)

Electron Density:

r_electron=3.30 gm/cc
note: r_{Manganonordite-(Ce)}=3.50 gm/cc.

Fermion Index

Fermion Index = 0.01784
Boson Index = 0.98216

Photoelectric:

PE_{Manganonordite-(Ce)}= 101.66 barns/electron
U=PE_{Manganonordite-(Ce)} x r_electron= 335.51 barns/cc.

Radioactivity:

GRapi = 17,815.79 (Gamma Ray American Petroleum Institute Units)

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

**Estimated Radioactivity from Manganonordite-(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 / 8.18 cm	396,212	1.07E-05	17,815.79	5.86
100 gm / 3.79 cm	39,621	1.07E-06	1,781.58	0.59
10 gm / 1.76 cm	3,962	1.07E-07	178.16	0.06
1 gm / 8.18 mm	396	1.07E-08	17.82	0.01
0.1 gm / 3.79 mm	40	1.07E-09	1.78	0.00
0.01 gm / 1.76 mm	4	1.07E-10	0.18	0.00
0.001 gm / 0.82 mm	0	1.07E-11	0.02	0.00

Weight of pure Manganonordite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.50 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 ( 0.88 % Th) From Sum REE Elements (17.69 % REE)

Manganonordite-(Ce) Classification

Dana Class:

72.5.2.6 (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.03-50 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 Manganonordite-(Ce) Information

References:

NAME( MinRec) PHYS. PROP.(Eur. J. Min.,Vol.10,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Manganonordite-(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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Print or Cut-and-Paste your Manganonordite-(Ce) Specimen Label here :

Manganonordite-(Ce)

Na3SrCeMn++Si6O17
Dana No: 72.5.2.6 Strunz No: VIII/G.03-50
Locality:

Notes: