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Nacareniobsite-(Ce) Mineral Data

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General Nacareniobsite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: NbNa3Ca3(Ce,La)(Si2O7)2OF3
Help on Composition: Composition: Molecular Weight = 830.67 gm
   Sodium      7.20 %  Na    9.70 % Na2O
   Calcium    13.99 %  Ca   19.58 % CaO
   Lanthanum   6.69 %  La    7.84 % La2O3
   Cerium     11.81 %  Ce   13.83 % Ce2O3
   Titanium    1.73 %  Ti    2.88 % TiO2
   Niobium     7.83 %  Nb   11.20 % Nb2O5
   Silicon    13.52 %  Si   28.93 % SiO2
   Oxygen     28.31 %  O
   Fluorine    8.92 %  F     8.92 % F
                -   %   F    -3.76 % -O=F2    
             ______        ______ 
             100.00 %       99.13 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Nb0.7Ti0.3Na2.6Ca2.9Ce0.7La0.4(Si2O7)2F3.9O0.7
Help on Environment: Environment: In groundmass and as a secondary mineral in an arfvedsonite-nepheline syenite.
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Found in the Kvanefjeld tunnel in the Ilimaussaq, intrusion, southern Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Natrium (sodium), Calcium, Rare Earths, NIOBium, and Silicon in the chemical formula.
Help on Name Pronunciation: Name Pronunciation: Nacareniobsite-(Ce) + Pronunciation Say NACARENIOBSITE-(CE)
 

Nacareniobsite-(Ce) Image

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  Nacareniobsite-(Ce)

Comments: White to light brownish nacareniobsite-(Ce) in an igneous rock matrix.
Location: Kvanefjeld Tunnel, Ilímaussaq massif, Greenland. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Nacareniobsite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.3258:1:1.313
Help on Cell Dimensions: Cell Dimensions: a = 18.901, b = 5.683, c = 7.462, Z = 2; beta = 101.29° V = 786.02 Den(Calc)= 3.51
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.077(1), 2.031(0.5), 2.955(0.5),
 

Physical Properties of Nacareniobsite-(Ce)

Help on Cleavage: Cleavage: {011} Good
Help on Color: Color: Colorless.
Help on Density: Density: 3.45
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Nacareniobsite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1923,KPDmeas= 0.1957,KC= 0.1968
Ncalc = 1.68 - 1.69
Help on Optical Data: Optical Data: Biaxial (+), a=1.662, b=1.671, g=1.692, bire=0.0300, 2V(Calc)=68, 2V(Meas)=66.
 

Calculated Properties of Nacareniobsite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.27 gm/cc
note: Specific Gravity of Nacareniobsite-(Ce) =3.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0089367139
Boson Index = 0.9910632861
Help on Photoelectric: Photoelectric: PENacareniobsite-(Ce) = 102.24 barns/electron
U=PENacareniobsite-(Ce) x relectron= 334.61 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 18,715.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Nacareniobsite-(Ce) per GRapi unit = 53.43 (PPM)

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

Estimated Radioactivity from Nacareniobsite-(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 / 8.21 cm 414,317 1.12E-05 18,715.97 6.15
100 gm / 3.81 cm 41,432 1.12E-06 1,871.60 0.62
10 gm / 1.77 cm 4,143 1.12E-07 187.16 0.06
1 gm / 8.21 mm 414 1.12E-08 18.72 0.01
0.1 gm / 3.81 mm 41 1.12E-09 1.87 0.00
0.01 gm / 1.77 mm 4 1.12E-10 0.19 0.00
0.001 gm / 0.82 mm 0 1.12E-11 0.02 0.00

Weight of pure Nacareniobsite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.45 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 ( 0.92 % Th) From Sum REE Elements (18.50 % REE)
 

Nacareniobsite-(Ce) Classification

Help on  Dana Class: Dana Class: 56.02.05.02 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.05)Mosandrite and related species
 
56.02.05.01 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2
 
56.02.05.02 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m
 
56.02.05.03 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m
 
56.02.05.04 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1
 
56.02.05.05 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2
 
56.02.05.06 IMA2008-024! (Ca,Na,REE,[])7(Nb,Ti)[Si2O7]2OF3 Cc m
 
56.02.05.07 Dovyrenite! Ca6Zr[Si2O7]2(OH)4 Pnnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BE.20 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.20 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m
 
09.BE.20 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2
 
09.BE.20 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2
 
09.BE.20 IMA2008-024! (Ca,Na,REE,[])7(Nb,Ti)[Si2O7]2OF3 Cc m
 

Other Nacareniobsite-(Ce) Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.75,p708,1990) OPTIC PROP.(Am.Min.,Vol.75,p708,1990)
Help on See Also: See Also: Links to other databases for Nacareniobsite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Nacareniobsite-(Ce) Specimen Label here :

Nacareniobsite-(Ce)

NbNa3Ca3(Ce,La)(Si2O7)2OF3
Dana No: 56.02.05.02 Strunz No: 09.BE.20
Locality:

 

Notes:

 

 
   
 


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