Mineralogy Database

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Sample n° 13897

Minerals found in the sample
Mineral Formula Category Subcategory Importance
BIOTITE K(Fe2+,Mg)3(AlSi3O10)(OH)2 phyllosilicates mica major
ANHYDRITE Ca(SO4) sulfates - minor
CALCITE Ca(CO3) carbonates - minor
PYRITE FeS2 sulfides and sulfosalts - minor
Description
Description: black crystals composed of stacked lamellae (4 cm)
Origin
  • Country: Madagascar
  • Region: Mahajanga Province
  • Locality: Mahazoma
Specification
  • Donors: Rakotomamonjy
    Donation year: 1981
  • Sampling year:
    Registration date:
  • Quantity: 1
    Size: 2
  • Dimension code 1>2>3: 2
    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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