A
Acanthite
Achroite
Actinolite
Adamite
Aegirine
Aegirine-Augite
Aenigmatite
Aeschynite-(Y)
Afghanite
Afwillite
Agardite Group
Ajoite
Akaganeite
Åkermanite
Alacránite
Albite
Allanite Group
Allanpringite
Alicewilsonite-(Y)
Allophane
Almandine (Garnet Supergroup)
Alstonite
Aluminium-bearing adamite
Alum-K
Alumochalcosiderite
Alumohydrocalcite
Alunite
Amesite
Amphibole Supergroup
Analcime
Anapaite
Anatase
Ancylite-(Ce)
Andalusite
Andersonite
Andradite (Garnet Group)
Angastonite
Anglesite
Ankerite ?
Annabergite
Annite
Anorthite
Antlerite
Antozonite (Fluorite)
Apatite
Apjohnite
Apophyllite
Aquamarine (Beryl Group)
Aragonite
Arfvedsonite
Armalcolite
Arsenic-bearing Vanadinite (formerly called Endlichite)
Arsendescloizite
Arseniosiderite
Arsenocrandallite
Arsenoflorencite-(Ce)
Arsenogorceixite
Arsenogoyazite
Arsenolite
Arsenopyrite
Arsentsumebite
Arthurite
Artinite
Artroeite
Asbecasite
Astrophyllite
Atacamite
Atelestite
Atencioite
Augite (Clinopyroxene Subgroup)
Auriacusite
Aurichalcite
Austinite
Austinite (copper bearing)
Autunite
Axinite
Azoproite
Azurite