Mineralogy Database

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Sample n° 804

Minerals found in the sample
Mineral Formula Category Subcategory Importance
BIOTITE K(Fe2+,Mg)3(AlSi3O10)(OH)2 phyllosilicates mica major
FELDSPAR - tektosilicates feldspar minor
Description
Description: large biotite crystals
Information: geochronology - Cahen, L., Delhal, J., Ledent, D. & Reinharz, M., 1963. L'âge des migmatites de Boma et de l'orogenèse ouest-congolienne. Indications préliminaires sur l'âge des formations Mayumbiennes et antérieures. Annales de la Société Géologique de Belgique 86, 229-269.
Origin
  • Country: Congo (RDC)
  • Region: Bas-Congo
  • Locality: Boma, new Matadi road
Specification
  • Donors: Ghardin
    Donation year: 1930
  • Sampling year:
    Registration date:
  • Quantity: 1
    Size: 2
  • Dimension code 1>2>3: 3
    Quality code 1>2>3: 1
  • Holotype: no
    Paratype: no
    Radioactive: no
  • Thin section: no
    Chemical analysis: no
    X-Ray spectra: no
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