Komarovite Mineral Data
General Komarovite Information
Chemical Formula:
(Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O)
Composition:
Molecular Weight = 502.73 gm
Sodium 0.91 % Na 1.23 % Na2 O
Calcium 3.19 % Ca 4.46 % CaO
Titanium 1.90 % Ti 3.18 % TiO2
Manganese 4.37 % Mn 5.64 % MnO
Niobium 33.26 % Nb 47.59 % Nb2 O5
Silicon 11.17 % Si 23.90 % SiO2
Hydrogen 1.40 % H 12.54 % H2 O
Oxygen 42.65 % O
Fluorine 1.13 % F 1.13 % F
- %
F -0.48 % -O=F2
______ ______
100.00 % 99.20 % = TOTAL OXIDE
Empirical Formula:
Ca0.4 Mn2+ 0.4 Na0.2 Nb1.8 Ti0.2 (Si2 O7 )O2.9 F0.3 �3.5(H2 O)
Environment:
In alkalic syenites.
IMA Status:
Approved IMA 1971
Locality:
Mt. Karnasurt, Lovozero massif, Kola peninsula, Russia. Link to MinDat.org Location Data.
Name Origin:
Named for Vladimir M. Komarov (1927-1967), Russian cosmonaut, who was killed during his return flight on April, 23, 1967.
Name Pronunciation:
Komarovite + Pronunciation
Synonym:
Ellsworthite
Silicified pyrochlore
Komarovite Image
Images:
Komarovite Crystallography
Axial Ratios:
a:b:c =1.5142:1:1.2278
Cell Dimensions:
a = 21.2, b = 14, c = 17.19, Z = 18; V = 5,101.99 Den(Calc)= 2.95
Crystal System:
Orthorhombic Space Group: Unk
X Ray Diffraction:
By Intensity(I/Io ): 3.16(1), 12.2(0.7), 1.783(0.47),
Physical Properties of Komarovite
Cleavage:
{001} Good
Color:
White, Light brown, Light pink.
Density:
3.61 - 3.76, Average = 3.68
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
Luminescence:
Non-fluorescent.
Luster:
Adamantine
Magnetism:
Nonmagnetic
Streak:
white
Optical Properties of Komarovite
Gladstone-Dale:
CI meas = 0.163 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = -0.045 (Good) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2673,KPDmeas = 0.214,KC = 0.2557 Ncalc = 1.75 - 1.96
Optical Data:
Biaxial (+), a=1.75, b=1.766, g=1.85, bire=0.1000
Calculated Properties of Komarovite
Electron Density:
Bulk Density (Electron Density)=2.86 gm/cc note: Specific Gravity of Komarovite =2.95 gm/cc.
Fermion Index:
Fermion Index = 0.0079306422 Boson Index = 0.9920693578
Photoelectric:
PEKomarovite = 50.93 barns/electronU=PEKomarovite x r Electron Density= 145.42 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Komarovite is Not Radioactive
Komarovite Classification
Dana Class:
56.02.04.12 (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 Komarovite Information
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Komarovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Komarovite
(Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O)
Dana No: 56.02.04.12 Strunz No: 09.CE.45
Locality:
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