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