A
   Aegirina                             NaFe3+Si2O6
   Afganite                             (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3· H2O
   Aftitalite                             (K,Na)3Na(SO4)2
   Afwillite                              Ca3Si2O4(OH)6
   Akermanite                         Ca2MgSi2O7
   Albite                                  NaAlSi3O8
   Allanite–(Ce)                      (Ce,Ca,Y)2(Al,Fe2+,Fe3+)3(SiO4)3(OH)
   Alunite                                K2Al6(SO4)4(OH)12
   Alunogeno                         Al2(SO4)3· 17H2O
   Analcime                            NaAlSi2O6· 6H2O
   Anatasio                            TiO2
   Andalusite                         Al2SiO5
   Andradite                           Ca3Fe23+(SiO4)3
   Anglesite                            PbSO4
   Anidrite                               CaSO4
   Annabergite                       Ni3(AsO4)2· 8H2O
   Anortite                               CaAl2Si2O8
   Antimonite                          Sb2S3
   Apatite                                 Ca5(PO4,CO3)3(F,OH,Cl)
   Apofillite                             KCa4Si8O20(F,OH)· 8H2O
   Aragonite                            CaCO3
   Arcanite                               K2SO4
   Asbecasite                          Ca3(Ti,Sn4+)As3+6Si2Be2O20
   Augite                                  (Ca,Na)(Mg,Al,Fe,Ti)(Si,Al)2O6
   Azzurrite                              Cu32+ (CO3)2(OH)2