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Table 2 Mineralogical composition of tailings

From: Characterization and assessment of potential environmental risk of tailings stored in seven impoundments in the Aries river basin, Western Romania

Mineral group Mineral species Chemical formula Impoundment
    Saliste Gura Rosiei Stefanca Sesei Cutii Sartas Brazesti
oxides quartz SiO2 ++ ++ ++ ++ ++ + ++
silicates albite NaAlSi3O8 ++   + +    ++
  muscovite KAl2(Si3Al)O10(OH,F)2     + + ++ +
  orthoclase AlKSi3O8 ++ ++    +   
  biotite NaFeKMgTiSi3O12   + +   ± ++  
  feldspar Al2CaSr O8Si2    ±     +
  anorthoclase AlCaKNaO8Si3 ±   ++ ++   +  
sulphides chalcopyrite CuFeS2    ±   ± ± ±
  pyrite FeS2 ±     ± ±  
  pyrrhotite Fe9S10   ±    ±   ±
  sphalerite ZnS       ±  
  galena PbS      ± ± ±
sulphates jarosite KFe3(SO4)2(OH)6      ± +  
  iron sulphate Fe2(SO4)3    + +    
  gypsum CaSO4      ± +  
  anglesite PbSO4      ± ±  
carbonates eitelite Na2Mg(CO3)2    ±     +
  baritocalcite BaCa(CO3)2    + ±    
  calcite CaCO3    ± ±    +
  rhodochrosite MnCO3       ±  
  dolomite CaMg(CO3)2   +      +
arsenic minerals wilhelmkleinite As2Fe2Zn O8(OH)2   ± ±     ±
  potassium hydroxo pentafluoro arsenate AsF5K(OH)        ±
  1. (++) - major (20–50%); (+) - minor (5–20%); (±) - trace (<5%).