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  Sample n° 8838
          Minerals found in the sample
          
            
	       
                
           
 
        
        
      
         | Mineral | Formula | Category | Subcategory | Importance | 
|---|---|---|---|---|
| COLUMBITE-(Fe) | Fe2+Nb2O6 | oxides and hydroxides | - | major | 
           Description
            
       
           
    
               Description:
               black block (4 cm)
            
                         
                Information:
                Gouder de Beauregard, C., Dubois, J. & Bourguignon, P., 1967. Comportement thermique des columbotantalites. Annales de la Société Géologique de Belgique 90, 501-518.
                        
     
      Origin
    
   
  
    - Country: Burundi
- Region: Bubanza
- Locality: Butara
        Specification
    
    
      
    
 
    
  - 
          Donors: Service Géologique du RwandaDonation year: 1961
- 
          Sampling year:Registration date:
- 
          Quantity: 1Size: 2
- 
          Dimension code 1>2>3: 3Quality code 1>2>3: 1
- 
          Holotype: noParatype: noRadioactive: no
- 
          Thin section: noChemical analysis: noX-Ray spectra: no