Acanthite
Acmite: see Aegirine
Actinolite
Adinolization
Adularia: see Orthoclase
Aegirine
Aegirine-augite
Aenigmatite
Agate = Chalcedony
Albite = Plagioclase
Albitization
Allanite
Almandine = Garnet
Alterations
Alteration of opaque minerals
Alunite
Alunitization
Amber
Analcime
Andalusite
Andesine = Plagioclase
Andradite = Garnet
Anhydrite
Anorthite = Plagioclase
Anthophyllite
Apatite
Apophyllite
Aragonite
Arfvedsonite
Argilization
Arsenopyrite
Augite
Azurite
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