Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Combeite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
Na2Ca2(Si6O18)0.5
System:
Trigonal

Classification of Combeite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.CJ.15a

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
61.1.2a.5

61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
14.6.1

14 : Silicates not Containing Aluminum
6 : Silicates of Ca with alkali or Mg or both
mindat.org URL:
http://www.mindat.org/min-1115.html
Please feel free to link to this page.

Type Occurrence of Combeite

Year of Discovery:
1957

Crystallography of Combeite

Crystal System:
Trigonal
Cell Parameters:
a = 10.42Å, c = 13.14Å
Ratio:
a:c = 1 : 1.261
Unit Cell Volume:
V 1,235.55 ų (Calculated from Unit Cell)

Optical Data of Combeite

Type:
Uniaxial (+)
RI values:
nω = 1.598 nε = 1.598
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Combeite

Formula:
Na2Ca2(Si6O18)0.5
Idealised Formula:
Na2Ca2Si3O9
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Zr,Al,Fe,Mn,Mg,Ba,K,F,Cl,S,P

Relationship of Combeite to other Species

Other Members of Group:
ImandriteNa12Ca3Fe23+(Si6O18)2
KapustiniteNa5(Na,Mn2+)<1Zr(H2Si6O18)
KazakoviteNa6Mn2+Ti(Si6O18)
KoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2O
LitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6
LovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O
TisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O
ZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)
9.CJ.05BazziteBe3Sc2(Si6O18)
9.CJ.05BerylBe3Al2(Si6O18)
9.CJ.05IndialiteMg2Al3(AlSi5O18)
9.CJ.05StoppaniiteBe3Fe23+(Si6O18) · H2O
9.CJ.10Cordierite(Mg,Fe)2Al3(AlSi5O18)
9.CJ.10Sekaninaite(Fe,Mg)2Al3(AlSi5O18)
9.CJ.15bImandriteNa12Ca3Fe23+(Si6O18)2
9.CJ.15aKazakoviteNa6Mn2+Ti(Si6O18)
9.CJ.15cKoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2O
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O
9.CJ.15aZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6
9.CJ.15aKapustiniteNa5(Na,Mn2+)<1Zr(H2Si6O18)
9.CJ.25BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
9.CJ.25AleksandroviteKCa7Sn2Li3Si12O36F2
9.CJ.30DioptaseCuSiO3 · H2O
9.CJ.35KostyleviteK2Zr(Si3O9) · H2O
9.CJ.40PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2O
9.CJ.45Gerenite-(Y)(Ca,Na)2(Y,REE)3Si6O18 · 2H2O
9.CJ.50OdintsoviteK2Na4Ca3Ti2Be4Si12O38
9.CJ.55MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6
9.CJ.60PezzottaiteCs(Be2Li)Al2(Si6O18)
14.6.2PectoliteNaCa2(HSi3O9)
14.6.3Pectolite-M2abcNaCa2[HSi3O9]
14.6.4DenisoviteCa2(K,Na)Si3O8(F,OH)2
14.6.5TokkoiteK2Ca4Si7O17(O,OH,F)4
14.6.6MountainiteKNa2Ca2[Si8O19(OH)] · 6H2O
14.6.7RhodesiteKHCa2Si8O19 · 5H2O
14.6.8MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2O
14.6.9ÅkermaniteCa2Mg(Si2O7)
14.6.10MonticelliteCaMgSiO4
14.6.11MerwiniteCa3Mg(SiO4)2
14.6.12DiopsideCaMgSi2O6
14.6.13Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2

Other Names for Combeite

Name in Other Languages:
German:Combeit
Russian:Комбит
Spanish:Combeita

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 Combeite

Reference List:
Sahama, T.G. and K. Hytönen (1957): Götzenite and combeite, two new
silicates from the Belgian Congo. Mineral. Mag., 31, 503-510. [abs. in American Mineralogist 43, 791.

American Mineralogist: 67: 418.

Ohsato, H., Takeuchi, Y., Maki, I. (1986): Structure of Na4Ca4[Si6O18]. Acta Crystallographica C42, 934-937.

Fischer, R.X., Tillmanns, E. (1987): Revised data for combeite, Na2Ca2Si3O9. Acta Crystallographica C43, 1852-1854.

Fischer, R.X., Tillmanns, E. (1983): Die Kristallstrukturen von natürlichem Na2Ca2Si3O9 vom Mt. Shaheru (Zaire) und aus dem Mayener Feld (Eifel), N. Jb. Mineral. Mh., 1983, 49-59.

Internet Links for Combeite

Localities for Combeite

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.
Democratic Republic of Congo (Zaïre)
 
  • Kivu
    • Goma
Andersen, T., Elburg, M. A., & Erambert, M. (2014). Extreme peralkalinity in delhayelite-and andremeyerite-bearing nephelinite from Nyiragongo volcano, East African Rift. Lithos, 206, 164-178.
Mineralogical Magazine 31 (1957) 698-699; Fischer, R.X. Tillmanns, E. (1983): Die Kristallstrukturen von natürlichem Na2Ca2Si3O9 vom Mt. Shaheru (Zaire) und aus dem Mayener Feld (Eifel), N. Jb. Mineral. Mh. 49-59.
Germany
 
  • Rhineland-Palatinate
    • Eifel
      • Mayen
        • Ettringen
          • Bellerberg volcano
            • Southern lava flow
              • Mayener Feld
Fischer, R.X. Tillmanns, E. (1983): Die Kristallstrukturen von natürlichem Na2Ca2Si3O9 vom Mt. Shaheru (Zaire) und aus dem Mayener Feld (Eifel), N. Jb. Mineral. Mh. 49-59.
Russia
 
  • Eastern-Siberian Region
    • Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai)
      • Maimecha and Kotui Rivers Basin
Henderson, C. M. B., Kogarko, L. N., & Plant, D. A. (1999). Extreme closed system fractionation of volatile-rich, ultrabasic peralkaline melt inclusions and the occurrence of djerfisherite in the Kugda alkaline complex, Siberia. Mineralogical Magazine, 63(3), 433-438.
Tanzania
 
  • Arusha Region
www.koeln.netsurf.de/~w.steffens/other.htm; Henderson, C. M. B., Kogarko, L. N., & Plant, D. A. (1999). Extreme closed system fractionation of volatile-rich, ultrabasic peralkaline melt inclusions and the occurrence of djerfisherite in the Kugda alkaline complex, Siberia. Mineralogical Magazine, 63(3), 433-438.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: August 29, 2015 08:28:18 Page generated: August 29, 2015 00:44:41