Mineralogy Database

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Sample n° 12792

Minerals found in the sample
Mineral Formula Category Subcategory Importance
MANGANESE OXIDES Mn-O oxides and hydroxides - major
OPAL SiO2•nH2O tektosilicates - minor
Description
Description: block with black manganese oxides and brown opal
Origin
  • Country: South Africa
  • Region: Northern Cape
  • Locality: Postmasburg
Specification
  • Donors: Verwoerd
    Donation year: 1972
  • Sampling year:
    Registration date:
  • Quantity: 1
    Size: 1
  • Dimension code 1>2>3: 1
    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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