Mineralogy Database

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Sample n° 13894

Minerals found in the sample
Mineral Formula Category Subcategory Importance
AMETHYST (quartz) SiO2 tektosilicates - major
GOETHITE FeO(OH) oxides and hydroxides - minor
Description
Description: geode (10 cm), with some small black goethite crystals
Origin
  • Country: Madagascar
  • Region: Mahajanga Province
  • Locality: Analalava
Specification
  • Donors: Rakotomamonjy
    Donation year: 1981
  • Sampling year:
    Registration date:
  • Quantity: 1
    Size: 2
  • 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: yes
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