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Sample n° 8037

Minerals found in the sample
Mineral Formula Category Subcategory Importance
COMBEITE Na4,5Ca3,5Si6O17,5(OH)0,5 cyclosilicates - major
DELHAYELITE K7Na3Ca5Al2Si14O38F4Cl2 phyllosilicates - minor
GOTZENITE NaCa6Ti(Si2O7)2OF3 sorosilicates - minor
KIRSCHSTEINITE CaFe2+(SiO4) nesosilicates - minor
Description
Description: grey block (10 cm)
Information: cotype of combeite, delhayelite, gotzenite and kirschsteinite (IMA Catalogue of Type Mineral Specimens) // original publications - Sahama, T.G. & Hytönen, K., 1957. Götzenite and combeite, two new silicates from the Belgian Congo. Mineralogical Magazine 31, 503-510. / Sahama, T.G. & Hytönen, K., 1957. Kirschsteinite, a natural analogue to synthetic iron monticellite, from the Belgian Congo. Mineralogical Magazine 31, 698-699. / Sahama, T.G. & Hytönen, K., 1959. Delhayelite, a new silicate from the Belgian Congo. Mineralogical Magazine 32, 6-9. // Platz, T., Foley, S.F. & André, L., 2004. Low-pressure fractionation of the Nyiragongo volcanic rocks, Virunga Province, D.R. Congo. Journal of Volcanology and Geothermal Research 136, 269-295. (RG 47185) // Andersen, T., Elburg, M. & Erambert, M., 2012. Petrology of combeite- and götzenite-bearing nephelinite at Nyiragongo, Virunga Volcanic Province in the East African Rift. Lithos 152, 105-121. // Andersen, T., Elburg, M.A. & Erambert, M., 2014. Extreme peralkalinity in delhayelite- and andremeyerite-bearing nephelinite from Nyiragongo volcano, East African Rift. Lithos 206/207, 164-178.
Origin
  • Country: Congo (RDC)
  • Region: Kivu
  • Locality: Rutshuru, Nyiragongo, Shaheru
Specification
  • Donors: Sahama
    Donation year: 1959
  • Sampling year:
    Registration date:
  • Quantity: 2
    Size: 2
  • Dimension code 1>2>3: 3
    Quality code 1>2>3: 1
  • Holotype: no
    Paratype: yes
    Radioactive: no
  • Thin section: no
    Chemical analysis: no
    X-Ray spectra: no
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