Na-komarovite Mineral Data


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General Na-komarovite Information
Help on Chemical Formula: Chemical Formula: Na6CaNb6[Si4O12F2·4(H2O)
Help on Composition: Composition: Molecular Weight = 1,359.81 gm
   Sodium     9.13 %  Na   12.31 % Na2O
   Calcium    2.36 %  Ca    3.30 % CaO
   Cerium     1.03 %  Ce    1.21 % Ce2O3
   Titanium   2.11 %  Ti    3.52 % TiO2
   Niobium   38.26 %  Nb   54.73 % Nb2O5
   Silicon    8.26 %  Si   17.67 % SiO2
   Hydrogen   0.59 %  H     5.30 % H2O
   Oxygen    35.18 %  O
   Fluorine   3.07 %  F     3.07 % F
               -   %  F    -1.29 % -O=F2
            ______        ______ 
            100.00 %       99.82 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na5.4Ca0.8Ce0.1Ti0.6Nb5.6(Si4O12)O13.9F2.2·4(H2O)
Help on Environment: Environment: In alkalic syenites.
Help on IMA Status: IMA Status: Discredited IMA 1979
Help on Locality: Locality: Ilimaussaq massif, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1979 for Vladimir M. Komarov (1927-1967), Russian cosmonaut who was killed during his return flight on April 23, 1967 and the sodium content.
Help on Synonym: Synonym: Komarovite-Na
  Silicified pyrochlore
  Sodium-Komarovite
 

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Na-komarovite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.2972:1:0.301
Help on Cell Dimensions: Cell Dimensions: a = 7.31, b = 24.588, c = 7.402, Z = 2; V = 1,330.42 Den(Calc)= 3.39
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mmm
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Balic-Zunic T , Petersen O V , Bernhardt H J , Micheelsen H I , Neues Jahrbuch fur Mineralogie, Monatshefte , 2002 (2002) p.497-514, The crystal structure and mineralogical description of a Na-dominant, komarovite from the Ilimaussaq alkaline complex, South Greenland, Locality: Ilimaussaq, South Greenland

 

Physical Properties of Na-komarovite

Help on Cleavage: Cleavage: [100] Perfect, [001] Fair
Help on Color: Color: White, Light yellowish white.
Help on Density: Density: 3.3
Help on Diaphaniety: Diaphaniety: Transparent to Translucent
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white
 

Optical Properties of Na-komarovite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.054 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2554,KPDmeas= 0.2623,KC= 0.2488
Help on Optical Data: Optical Data: Biaxial (-), a=1.809, b=1.876, g=1.912, bire=0.1030, 2V(Calc)=70, 2V(Meas)=72. Dispersion r >> v.
 

Calculated Properties of Na-komarovite

Help on Electron Density: Electron Density:

relectron=3.23 gm/cc
note: rNa-komarovite =3.39 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00679
Boson Index = 0.99321
Help on Photoelectric: Photoelectric:

PENa-komarovite = 63.01 barns/electron
U=PENa-komarovite x relectron= 203.25 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1,045.91 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Na-komarovite - mild
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 23,081 6.24E-07 1,045.91 0.34
100 gm / 3.83 cm 2,308 6.24E-08 104.59 0.03
10 gm / 1.78 cm 231 6.24E-09 10.46 0.00
1 gm / 8.26 mm 23 6.24E-10 1.05 0.00
0.1 gm / 3.83 mm 2 6.24E-11 0.10 0.00
0.01 gm / 1.78 mm 0 6.24E-12 0.01 0.00
0.001 gm / 0.83 mm 0 6.24E-13 0.00 0.00

Weight of pure Na-komarovite 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 ( 0.05 % Th) From Sum REE Elements ( 1.03 % REE)
 

Na-komarovite Classification
Help on Dana Class: Dana Class: 56.2.4.13 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.2)with cations in [4] and/or >[4] coordination
  (56.2.4)Cuspidine - Wohlerite group
 
56.2.4.1 Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m
 
56.2.4.2 Burpalite Na2CaZrSi2O7F2 P 21/a 2/m
 
56.2.4.3 Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m
 
56.2.4.4 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m
 
56.2.4.5 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m
 
56.2.4.6 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
 
56.2.4.7 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
 
56.2.4.8 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
 
56.2.4.9 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
 
56.2.4.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m
 
56.2.4.11 Jennite Ca9Si6O18(OH)6·8H2O P1 1
 
56.2.4.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2·3.5(H2O) Unk Ortho
 
56.2.4.13 Na-komarovite ? Na6CaNb6[Si4O12F2·4(H2O) C mmm 2/m 2/m 2/m
 
56.2.4.14 Suolunite Ca2Si2O5(OH)2·(H2O) F dd2 mm2
 
56.2.4.15 Mongolite Ca4Nb6Si5O24(OH)10·5(H2O) Unk Tetra
 
56.2.4.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1
 
56.2.4.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1
Help on Strunz Class: Strunz Class: VIII/C.16-10 VIII - Silicates
  VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]
  VIII/C.16 - Komarovite series
 
VIII/C.16-10 Na-komarovite Na6CaNb6[Si4O12F2·4(H2O) C mmm 2/m 2/m 2/m
 
VIII/C.16-20 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2·3.5(H2O) Unk Ortho
 
VIII/C.16-30 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m
 

Other Na-komarovite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin, v 88, p 935) OPTIC PROP.(AmMin, v 88, p 935)
Help on See Also: See Also: Links to other databases for Na-komarovite :
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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Na-komarovite

Na6CaNb6[Si4O12F2·4(H2O)
Dana No: 56.2.4.13 Strunz No: VIII/C.16-10
Locality:

 

Notes:

 
 
   
 
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