A

Acanthite

Achroite

Actinolite

Adamite

Aegirine

Aegirine-Augite

Agardite

Ajoite

Akaganeite

Åkermanite

Alalite

Allanite-(Ce)

Allanpringite

Allophane

Almandine (Garnet Supergroup)

Alstonite

Alumohydrocalcite

Amesite

Amphibole Supergroup

Analcime

Anatase

Andersonite

Andradite (Garnet Supergroup)

Anglesite

Ankerite ?

Annabergite

Anorthite

Antlerite

Antozonite (Fluorite)

Apatite

Apophyllite

Aquamarine (Beryl Group)

Aragonite

Arfvedsonite

Arsenic-bearing Vanadinite (formerly called Endlichite)

Arseniosiderite

Arsenogorceixite

Arsenogoyazite

Arsenopyrite

Artinite

Asbecasite

Astrophyllite

Atacamite

Atelestite

Atencioite

Augite (Clinopyroxene Subgroup)

Aurichalcite

Austinite

Autunite

Axinite

Azurite