Abernathyite		K(UO2)(AsO4)·4(H2O)
Acanthite	Silver Glance	Ag2S
Actinolite	Byssolite Hexagonite (Mn) Mountain Leather Nephrite Jade Smaragdite - emerald green	Ca2(Mg,Fe++)5Si8O22(OH)2
Adamite		Zn2(AsO4)(OH)
Adamsite	IMA1999-020	NaY(CO3)2·6H2O
Aegirine	Acmite	NaFe+++Si2O6
Aeschynite-(Y)	Eschynite	(Y,Ca,Fe)(Ti,Nb)2(O,OH)6
Afwillite		Ca3Si2O4(OH)6
Agardite-(Ca)		CaCu6(AsO4)3(OH)6·3(H2O)
Agrinierite		(K2,Ca,Sr)U3O10·4(H2O)
Ajoite		(K,Na)Cu7AlSi9O24(OH)6·3(H2O)
Albite	Ab100 An0 Clevelandite	NaAlSi3O8
Allactite		Mn7(AsO4)2(OH)8
Allanite-(Ce)	Orthite	(Ce,Ca,Y)2(Al,Fe+++)3(SiO4)3(OH)
Alluaudite	Huhnerkobelite	NaCaFe++(Mn,Fe++,Fe+++,Mg)2(PO4)3
Almandine	Almandite	Fe++3Al2(SiO4)3
Alstonite		BaCa(CO3)2
Altaite		PbTe
Althausite		Mg2(PO4)(OH,F,O)
Aluminite	Websterite	Al2(SO4)(OH)4·7(H2O)
Amber	Bernstein Xyloretinite-C10H17O Resin Succinite	[C,H,O]
Amblygonite		(Li,Na)Al(PO4)(F,OH)
Aminoffite		Ca3Be2Si3O10(OH)2
Analcime	Analcidite Analcite Analzim	NaAlSi2O6·(H2O)
Anapaite		Ca2Fe++(PO4)2·4(H2O)
Anatase	Octahedrite	TiO2
Ancylite-(Ce)		SrCe(CO3)2(OH)·(H2O)
Andalusite	Chiastolite	Al2SiO5 = Al[6]Al[5]OSiO4
Andesine	An40 Ab60	(Na,Ca)(Si,Al)4O8
Andorite		PbAgSb3S6
Andradite	Demantoid - green Topazolite - yellow Melanite - black	Ca3Fe+++2(SiO4)3
Andradite_Demantoid	Demantoid - green Topazolite - yellow Melanite - black	Ca3Fe+++2(SiO4)3
Anglesite	Lead Spar Lead Vitrol	PbSO4
Anhydrite	Calcium Sulfate	CaSO4
Annabergite	Nickel Bloom	Ni3(AsO4)2·8(H2O)
Anorthite	An100 Indianite Ab0	CaAl2Si2O8
Anthophyllite		[ ]Mg7Si8O22(OH)2
Antimony		Sb
Antlerite		Cu3(SO4)(OH)4
Apatite	Davisonite-mixture with crandallite Dennisonite-mixture with crandallite	Ca5(PO4)3(OH,F,Cl)
Apophyllite_Stilbite		KCa4(Si4O10)2F·8(H2O)
Aragonite	Nicolsonite (Zn) Tarnowitzite (Pb)	CaCO3
Arfvedsonite		NaNa2(Fe++4Fe+++)Si8O22(OH)2
Argentopyrite		AgFe2S3
Argyrodite		Ag8GeS6
Armenite	Calciocelsian	BaCa2Al6Si9O30·2(H2O)
Arsendescloizite		PbZn(AsO4)(OH)
Arsenic		As
Arseniosiderite		Ca2Fe+++3(AsO4)3O2·3(H2O)
Arsenolite		As2O3
Arsenopyrite	Arsenical pyrite Mispickel Bismuthian Arsenopyrite Cobaltian Arsenopyrite	FeAsS
Arsentsumebite		Pb2Cu(AsO4)(SO4)(OH)
Arthurite_Pharmocosiderite		CuFe+++2(AsO4,PO4,SO4)2(O,OH)2·4(H2O)
Artinite	Cuproartinite-Cu	Mg2(CO3)(OH)2·3(H2O)
Asbecasite		Ca3(Ti,Sn)As+++6Si2Be2O20
Astrophyllite		K2Na(Fe++,Mn,Mg,[ ])7[Ti2(Si4O12)203](OH.F)4
Atacamite	Paratacamite	Cu2Cl(OH)3
Augelite		Al2(PO4)(OH)3
Augite	Fassaite	(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6
Aurichalcite		(Zn,Cu)5(CO3)2(OH)6
Austinite		CaZn(AsO4)(OH)
Autunite	Lime Uranite	Ca(UO2)2(PO4)2·10-12(H2O)
Azurite	Chessylite	Cu3(CO3)2(OH)2
Azurite and Malachite	Chessylite	Cu3(CO3)2(OH)2