Nacareniobsite-(Ce) Mineral Data + Say NACARENIOBSITE-(CE)

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.
 

Nacareniobsite-(Ce) Image

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Nacareniobsite-(Ce)

Comments: White to light brownish nacareniobsite-(Ce) in an igneous rock matrix.
Location: Kvanefjeld Tunnel, Il?maussaq 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 - PrismaticH-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 Diaphaniety: Diaphaniety: 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
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:

relectron=3.27 gm/cc
note: rNacareniobsite-(Ce) =3.45 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00893
Boson Index = 0.99107
Help on Photoelectric: Photoelectric:

PENacareniobsite-(Ce) = 102.24 barns/electron
U=PENacareniobsite-(Ce) x relectron= 334.61 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 18,715.92 (Gamma Ray American Petroleum Institute Units)

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 414,316 1.12E-05 18,715.92 6.15
100 gm / 3.81 cm 41,432 1.12E-06 1,871.59 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: 56.2.5.2 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.2)with cations in [4] and/or >[4] coordination
  (56.2.5)Mosandrite and related species
 
56.2.5.1 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2
 
56.2.5.2 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m
 
56.2.5.3 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m
 
56.2.5.4 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1
 
56.2.5.5 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2
Help on Strunz Class: Strunz Class: VIII/C.12-30 VIII - Silicates
  VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]
  VIII/C.12 - Götzenite - Nacareniobsite-(Ce) series
 
VIII/C.12-10 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2
 
VIII/C.12-20 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2
 
VIII/C.12-30 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m
 
VIII/C.12-40 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
 
VIII/C.12-50 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1
 
VIII/C.12-55 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1
 
VIII/C.12-60 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
 

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Nacareniobsite-(Ce)

NbNa3Ca3(Ce,La)(Si2O7)2OF3
Dana No: 56.2.5.2 Strunz No: VIII/C.12-30
Locality:

 

Notes:

 
 
   
 
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