| Actinolite | |
| Adelite | |
| Admontite | |
| 'Aegirine-augite' | |
| Aerinite | | Ca | | (Fe | | ,Al,Fe | | ,Mg)(Al,Mg) | | [HSi | | O | | (OH) | | ][(CO | | ) | | (H | | O) | | ] |
|
| Åkermanite | |
| Akimotoite | |
| Akrochordite | |
| Aksaite | |
| Albrechtschraufite | |
| Aldermanite | |
| 'Aldzhanite' | |
| Aliettite | |
| 'Alipite' | |
| 'Allophite' | |
| Alluaudite | | (Na,Ca)Mn | | (Fe | | ,Mn | | ,Fe | | ,Mg) | | (PO | | ) | | |
|
| Almarudite | | K([],Na) | | (Mn | | ,Fe | | ,Mg) | | (Be,Al) | | [Si | | O | | ] |
|
| 'Aloisiite' | |
| Alpersite | |
| Althausite | |
| 'Alumino-magnesio-hornblende' | |
| Alumino-Magnesiotaramite | | Na[CaNa][Mg | | Al | | ][(OH) | | |Al | | Si | | O | | ] |
|
| 'Aluminobarroisite' | | ☐[CaNa][Mg | | Al | | ][(OH) | | |AlSi | | O | | ] |
|
| Aluminoceladonite | | K(Mg,Fe | | )(Al,Fe | | )[(OH) | | |Si | | O | | ] |
|
| Aluminomagnesiohulsite | |
| Aluminotschermakite | |
| 'Alumo-chrompicotite' | |
| 'Alumoberezovite' | |
| 'Alurgite' | |
| Amakinite | |
| Amesite | |
| 'Ammonium-Bromcarnallite' | |
| 'Ammonium-Carnallite' | |
| 'Ammonium-Kainite' | |
| Anandite | | (Ba,K)(Fe | | ,Mg) | | [(O,OH) | | |(Si,Al,Fe) | | O | | ] |
|
| Angastonite | |
| 'Anhydrokainite' | |
| Ankerite | |
| Anthophyllite | |
| Antigorite | |
| 'Antillite' | |
| 'Aphrosiderite' | |
| 'Aquacreptite (of Harada)' | |
| 'Aquacreptite (of Shepard)' | | Mg | | Fe | | Si | | O | | ·8H | | O with some Al | | O | | , or near· |
|
| Arakiite | | (Zn,Mn | | )(Mn | | ,Mg) | | (Fe | | ,Al) | | (AsO | | )(AsO | | ) | | (OH) | | |
|
| 'Arctolite' | |
| Ardennite-(As) | | Mn | | [(Al,Mg) | | ][(OH) | | |(AsO | | ,VO | | )|(SiO | | ) | | |Si | | O | | ] |
|
| Ardennite-(V) | | Mn | | [Al | | (Mg,Al,Fe | | ,Mn | | ) | | ][(OH) | | |(VO | | ,SiO | | )|(SiO | | ) | | |Si | | O | | ] |
|
| Arhbarite | |
| Aristarainite | |