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Komarovite

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Formula:
(Ca,Mn)Nb2[O3|Si2O7] · 3.5H2O
System:
Orthorhombic
Colour:
pale rose, white
Hardness:
1 - 2
Name:
Named in 1971 by A. M. Portnov, G. K. Krivokoneva, and T. I. Stolyarova in honor of Russian cosmonaut Vladimir Mikhaylovich Komarov [March 16, 1927 Moscow, Russia - April 24, 1967 (died while orbiting the Earth)].
See also natrokomarovite.

Classification of Komarovite

Approved 1971
9.CE.45

9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
56.2.4.12

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
17.8.15

17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
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First Recorded Occurrence of Komarovite

Year of Discovery:
1971

Physical Properties of Komarovite

Diaphaneity (Transparency):
Transparent, Translucent
Colour:
pale rose, white
Streak:
white
Hardness (Mohs):
1 - 2
Fracture:
None observed
Density:
3 g/cm3 (Measured)    2.96 g/cm3 (Calculated)

Crystallography of Komarovite

Crystal System:
Orthorhombic
Cell Parameters:
a = 21.3Å, b = 14Å, c = 17.19Å
Ratio:
a:b:c = 1.521 : 1 : 1.228
Unit Cell Volume:
V 5,126.06 ų (Calculated from Unit Cell)
Z:
18
Morphology:
Platy, foliated, massive.
X-Ray Powder Diffraction Data:
d-spacingIntensity
12.2 (70)
6.35 (30)
5.44 (30)
3.16 (100)
3.118 (40)
2.740 (40)
2.715 (30)
1.783 (50)

Optical Data of Komarovite

Type:
Biaxial (+)
RI values:
nα = 1.750 nβ = 1.766 nγ = 1.850
2V:
Measured: 48°
Max Birefringence:
δ = 0.100
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v marked

Chemical Properties of Komarovite

Formula:
(Ca,Mn)Nb2[O3|Si2O7] · 3.5H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Fe,Mn,Na,K

Relationship of Komarovite to other Species

9.CE.05PapagoiteCaCu[H3AlSi2O9]
9.CE.10VerplanckiteBa2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2 · 3H2O or near
9.CE.15BaotiteBa4(Ti,Nb)8Si4O28Cl
9.CE.20NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2Cl
9.CE.20TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2Clx
9.CE.20TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx
9.CE.25Bario-orthojoaquinite(Ba,Sr)4Fe2Ti2[Si4O12]2O2 · H2O
9.CE.25Byelorussite-(Ce)NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2O
9.CE.25Joaquinite-(Ce)NaBa2Ce2FeTi2[Si4O12]2O2(OH,F) · H2O
9.CE.25Orthojoaquinite-(Ce)NaBa2Ce2FeTi2[Si4O12]2O2(O,OH) · H2O
9.CE.25StrontiojoaquiniteSr2Ba2(Na,Fe)2Ti2[Si4O12]2O2(O,OH)2 · H2O
9.CE.25Strontio-orthojoaquinite(Na,Fe)2Sr2Ba2Ti2[Si4O12]2O2(O,OH)2 · H2O
9.CE.25Orthojoaquinite-(La)NaBa2La2Fe2+Ti2[Si4O12]2O2(O,OH) · H2O
9.CE.30eLabuntsovite-MnNa4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O
9.CE.30aNenadkevichite(Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O
9.CE.30dLemmleinite-KK2(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O
9.CE.30aKorobitsyniteNa2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2O
9.CE.30cKuzmenkoite-MnK2Mn2+(Ti,Nb)4(Si4O12)2(OH,O)4 · 5-6H2O
9.CE.30bVuoriyarvite-KK2(Nb,Ti)2(Si4O12)(O,OH)2 · 4H2O
9.CE.30bTsepinite-NaNa2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O
9.CE.30cKarupmøllerite-Ca(Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 7H2O
9.CE.30eLabuntsovite-MgNa4K4(Ba,K)2Mg(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2O
9.CE.30eLabuntsovite-FeNa4K4(Ba,K)2Fe2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2O
9.CE.30dLemmleinite-BaNa2K2Ba(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O
9.CE.30cGjerdingenite-FeK2Fe2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30hNeskevaaraite-FeK3Na2Fe2+(Ti,Nb)4(Si4O12)2(O,OH)4 · 5-6 H2O
9.CE.30bTsepinite-KK2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O
9.CE.30bParatsepinite-BaBa4(Ti,Nb)8(Si4O12)4(OH,O)8 · 8H2O
9.CE.30bTsepinite-CaCa(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O
9.CE.30hAlsakharovite-ZnNaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O
9.CE.30cGjerdingenite-MnK2Mn2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30cLepkhenelmite-Zn(Ba,K)2Zn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O
9.CE.30bTsepinite-SrSr(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O
9.CE.30bParatsepinite-Na(Na,Sr,K,Ca)7(Ti,Nb)8(Si4O12)4(O,OH)8·nH2O n ~ 8
9.CE.30fParalabuntsovite-MgNa8K8Mg8Ti16(Si4O12)8(O,OH)16· nH2O
9.CE.30cGjerdingenite-CaK2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30cGjerdingenite-NaK2Na2(Nb,Ti)4(Si4O12)2(OH,O)4 · 5H2O
9.CE.30hGutkovaite-MnK2CaMn(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O
9.CE.30cKuzmenkoite-ZnK2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8H2O
9.CE.30gOrganovaite-MnK2Mn(Nb,Ti)4(Si4O12)2(O,OH)4 · 5-7H2O
9.CE.30gOrganovaite-ZnK2Zn(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O
9.CE.30gParakuzmenkoite-Fe(K,Ba)4Fe(Ti,Nb)8(Si4O12)4(O,OH)8 · 14H2O
9.CE.30cBurovaite-Ca(Na,K)4Ca2(Ti,Nb)8(Si4O12)4(OH,O)8 · 12H2O
9.CE.45Natrokomarovite(Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2O
17.8.1EpistoliteNa2(Nb,Ti)2(Si2O7)O2 · nH2O
17.8.2MurmaniteNa2Ti2(Si2O7)O2 · 2H2O
17.8.3PerraultiteBaNaMn42+Ti2 (Si2O7)2O2(OH)2F
17.8.4Niocalite(Ca,Nb)4(Si2O7)(O,OH,F)2
17.8.5MongoliteCa4Nb6Si5O24(OH)10 · nH2O
17.8.6FersmaniteCa4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3
17.8.7Nacareniobsite-(Ce)Na3Ca3(Ce,La,Nd)Nb(Si2O7)2OF3
17.8.8Nenadkevichite(Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O
17.8.9Natrokomarovite(Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2O
17.8.10WöhleriteNaCa2(Zr,Nb)(Si2O7)(O,OH,F)2
17.8.11BelkoviteBa3(Nb,Ti)6(Si2O7)2O12
17.8.12BaotiteBa4(Ti,Nb)8Si4O28Cl
17.8.13Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
17.8.14Ilímaussite-(Ce)(Na,K)7-8(Ba,K)10Ce5(Nb,Ti)6(Si3O9)4(Si9O18)O6(O,OH)24
17.8.16Manganbelyankinite(Mn,Ca)(Ti,Nb)5O12 · 9H2O
17.8.17Niobophyllite(K,Na)3(Fe,Mn)6(Nb,Ti)2Si8(O,OH,F)31
17.8.18Caesium-Kupletskite

Other Names for Komarovite

Name in Other Languages:
Simplified Chinese:硅铌钙石
Spanish:Komarovita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Komarovite

Reference List:
Portnov, A.M., G.K.Krivokoneva & T.I. Stolyarova (1971): "Komarovite, a new niobosilicate of calcium and manganese": Zap. Vses. Mineral. Obshch.: 100: 599-602.
American Mineralogist (1971): 57: 1315 (abstract)

Krivokoneva, G.K., Portnov, A.M., Semenov, E.I., and Dubakina, L.S. (1979) Komarovite: silicified pyrochlore. Doklady Akademii Nauk SSSR: 248: 443-444.

Internet Links for Komarovite

Localities for Komarovite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Greenland
 
  • Kujalleq
    • Narsaq
Sørensen, H. (2001): The Ilimaussaq alkaline complex, South Greenland: status of mineralogical research with new results, Geology of Greenland Survey Bulletin 190, GEUS;Balić-Žunić T, Petersen O V, Bernhardt H J, Micheelsen H I (2002) The crystal structure and mineralogical description of a Na-dominant komarovite from Ilímaussaq alkaline complex, South Greenland. Neues Jahrbuch für Mineralogie, Monatshefte 2002, 497-514.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
Pekov, I.V. & Podlesnyi, A.S. (2004): Kukisvumchorr Deposit: Mineralogy of Alkaline Pegmatites and Hydrotermalites. Mineralogical Almanac, vol. 7, 140 pages + xxiv photo's pages
Mineral News, 27 (2011), #8, 12.
        • Lovozero Massif
Arzamastsev, A., Yakovenchuk, V., Pakhomovsky, Y., & Ivanyuk, G. (2008). The Khibina and Lovozero alkaline massifs: Geology and unique mineralization. In Guidbook for 33rd International Geological Congress Excursion (No. 47, p. 58).
I. Pekov (1998) Minerals First Discovered on the Territory of the former Soviet Union; New Data on Minerals M., 2004 Vol 39 pp 5-13
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