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Manoel Ambrósio Ranch, São Geraldo do Araguaia, Pará, North Region, Brazil

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An opal deposit discovered in 1991.
http://sbg.igc.usp.br/rgb/vol30_down/3002/3002251.pdf.




Group 3 - Halides
  		• Halite3.AA.20
    NaCl
    Group 4 - Oxides and Hydroxides
  		• Cristobalite4.DA.15
    SiO
     
    2
  		• Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
      var: Boulder Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
      var: Fire Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
      var: Jasper Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
      var: Precious Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
  		• Quartz4.DA.05
    SiO
     
    2
  		• Rutile4.DB.05
    TiO
     
    2
  		• Tridymite4.DA.10
    SiO
     
    2
    Group 9 - Silicates
  		• Biotite9..
  		• Kyanite9.AF.15
    Al
     
    2
    		[O|SiO
     
    4
    		]
    Unclassified Minerals
  		• 'Chalcedony'-
      'var: Onyx'-
    SiO
     
    2
  		• 'Chlorite Group'-


    15 entries listed. 11 valid minerals.

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