Komarovite Mineral Data

Komarovite Mineral Data +

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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 % Na₂O

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 % Nb₂O₅

Silicon 11.17 % Si 23.90 % SiO₂

Hydrogen 1.40 % H 12.54 % H₂O

Oxygen 42.65 % O

Fluorine 1.13 % F 1.13 % F

- % F -0.48 % -O=F₂

______ ______

100.00 % 99.20 % = TOTAL OXIDE

Empirical Formula:

Ca_0.4Mn²⁺_0.4Na_0.2Nb_1.8Ti_0.2(Si₂O₇)O_2.9F_0.3·3.5(H₂O)

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.

Synonym:

Ellsworthite

Silicified pyrochlore

Komarovite Image

Images:

Komarovite

Comments: Pale pink crystalline komarovite vein in syenite rock.
Location: Mount Karnasurt, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 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

Diaphaniety:

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

Optical Data:

Biaxial (+), a=1.75, b=1.766, g=1.85, bire=0.1000

Calculated Properties of Komarovite

Electron Density:

r_electron=2.86 gm/cc
note: r_Komarovite=2.95 gm/cc.

Fermion Index

Fermion Index = 0.00793
Boson Index = 0.99207

Photoelectric:

PE_Komarovite= 50.93 barns/electron
U=PE_Komarovite x r_electron= 145.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Komarovite is Not Radioactive

Komarovite Classification

Dana Class:

56.2.4.12 (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

Strunz Class:

VIII/C.16-20 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 Komarovite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Komarovite Specimen Label here :

Komarovite

(Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2·3.5(H2O)
Dana No: 56.2.4.12 Strunz No: VIII/C.16-20
Locality:

Notes: