Natrokomarovite Mineral Data

General Natrokomarovite Information

Chemical Formula:

Na6CaNb6[Si4O12F2•4(H2O)

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

Empirical Formula:

Na_5.4Ca_0.8Ce_0.1Ti_0.6Nb_5.6(Si₄O₁₂)O_13.9F_2.2ï¿½4(H₂O)

Environment:

In alkalic syenites.

IMA Status:

Not Approved IMA 1979

Locality:

Ilimaussaq massif, Greenland. Link to MinDat.org Location Data.

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.

Synonym:

Na-komarovite - Renamed Natrokomarvovite by Mineralogical Record, v39 (2008), p131

Silicified pyrochlore

Sodium-Komarovite

Natrokomarovite Crystallography

Axial Ratios:

a:b:c =0.2972:1:0.301

Cell Dimensions:

a = 7.31, b = 24.588, c = 7.402, Z = 2; V = 1,330.42 Den(Calc)= 3.39

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mmm

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

By Intensity(I/I_o): 3.149(1), 3.174(1), 12.364(0.9),

Physical Properties of Natrokomarovite

Cleavage:

{100} Perfect, {001} Fair

Color:

White, Light yellowish white.

Density:

3.3

Diaphaneity:

Transparent to Translucent

Habit:

Foliated - Two dimensional platy forms.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

4 - Fluorite

Luster:

Adamantine

Streak:

white

Optical Properties of Natrokomarovite

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
Ncalc = 1.82 - 1.84

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 Natrokomarovite

Electron Density:

Bulk Density (Electron Density)=3.23 gm/cc
note: Specific Gravity of Natrokomarovite =3.39 gm/cc.

Fermion Index:

Fermion Index = 0.0067914217
Boson Index = 0.9932085783

Photoelectric:

PE_{Natrokomarovite}= 63.01 barns/electron
U=PE_{Natrokomarovite} x r_electron= 203.25 barns/cc.

Radioactivity:

GRapi = 1,045.91 (Gamma Ray American Petroleum Institute Units)
Concentration of Natrokomarovite per GRapi unit = 956.11 (PPM)

**Estimated Radioactivity from Natrokomarovite** - 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 Natrokomarovite 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)

Natrokomarovite Classification

Dana Class:

56.02.04.13 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.02)with cations in [4] and/or >[4] coordination

(56.02.04)Cuspidine - Wohlerite group

56.02.04.01 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

56.02.04.02 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

56.02.04.03 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

56.02.04.04 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

56.02.04.05 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

56.02.04.06 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

56.02.04.07 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

56.02.04.08 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1

56.02.04.09 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

56.02.04.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

56.02.04.11 Jennite Ca9Si6O18(OH)6•8H2O P1 1

56.02.04.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho

56.02.04.13 Natrokomarovite* Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m

56.02.04.14 Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2

56.02.04.15 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra

56.02.04.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1

56.02.04.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

56.02.04.18 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 2₁ 2/m

Strunz Class:

09.CE.45 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),

09.CE.45 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho

09.CE.45 Natrokomarovite* Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m

Other Natrokomarovite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin, v 88, p 935) OPTIC PROP.(AmMin, v 88, p 935)

See Also:

Links to other databases for Natrokomarovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Natrokomarovite

Na6CaNb6[Si4O12F2•4(H2O)
Dana No: 56.02.04.13 Strunz No: 09.CE.45
Locality:

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